<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Gravitational Attraction</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #0f172a;
      color: #f8fafc;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      height: 100%;
      overflow: hidden;
      user-select: none;
    }

    .header-bar {
      width: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 10px 16px 0;
      z-index: 10;
    }

    .toggle-btn {
      background: #2563eb;
      color: #ffffff;
      border: 2px solid #3b82f6;
      border-radius: 20px;
      padding: 8px 18px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
      box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
    }
    .toggle-btn.off {
      background: #dc2626;
      border-color: #ef4444;
      box-shadow: 0 0 12px rgba(220, 38, 38, 0.4);
    }

    .svg-container {
      width: 100%;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    svg {
      width: 100%;
      height: 100%;
      max-height: 420px;
    }

    .label-box {
      font-size: 12px;
      font-weight: 700;
      fill: #ffffff;
      text-anchor: middle;
      dominant-baseline: middle;
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <button id="toggleBtn" class="toggle-btn" type="button">
      <span id="btnIcon">✓</span> <span id="btnText">Gravity: ON</span>
    </button>
  </div>

  <div class="svg-container">
    <svg id="scene" viewBox="0 0 500 370">
      <defs>
        
        <filter id="sunGlow" x="-50%" y="-50%" width="200%" height="200%">
          <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />
          <feMerge>
            <feMergeNode in="blur" />
            <feMergeNode in="SourceGraphic" />
          </feMerge>
        </filter>

        
        <marker id="arrowGravity" markerWidth="8" markerHeight="8" refX="6" refY="4" orient="auto">
          <path d="M 0 1 L 7 4 L 0 7 z" fill="#38bdf8" />
        </marker>

        
        <marker id="arrowVelocity" markerWidth="8" markerHeight="8" refX="6" refY="4" orient="auto">
          <path d="M 0 1 L 7 4 L 0 7 z" fill="#4ade80" />
        </marker>
      </defs>

      
      <g id="stars" opacity="0.6">
        <circle cx="45" cy="40" r="1.5" fill="#ffffff"/>
        <circle cx="120" cy="80" r="1" fill="#ffffff"/>
        <circle cx="430" cy="60" r="1.5" fill="#ffffff"/>
        <circle cx="460" cy="280" r="1.2" fill="#ffffff"/>
        <circle cx="60" cy="300" r="1" fill="#ffffff"/>
        <circle cx="180" cy="340" r="1.5" fill="#ffffff"/>
        <circle cx="360" cy="330" r="1" fill="#ffffff"/>
        <circle cx="390" cy="140" r="1.2" fill="#ffffff"/>
      </g>

      
      <circle id="orbitPath" cx="250" cy="185" r="130" fill="none" stroke="#64748b" stroke-width="2" stroke-dasharray="6,6" opacity="0.65" />

      
      <g id="gravityGroup">
        <line id="gravityLine" x1="380" y1="185" x2="295" y2="185" stroke="#38bdf8" stroke-width="3.5" marker-end="url(#arrowGravity)" stroke-linecap="round"/>
        
        <g id="gravityTag">
          <rect id="gravityBg" x="290" y="168" width="132" height="20" rx="10" fill="#0369a1" opacity="0.9" />
          <text id="gravityText" x="356" y="179" class="label-box" font-size="11">Sun's Gravity Pulls Inward</text>
        </g>
      </g>

      
      <g id="forwardGroup">
        <line id="forwardLine" x1="380" y1="185" x2="380" y2="135" stroke="#4ade80" stroke-width="3" marker-end="url(#arrowVelocity)" stroke-linecap="round"/>
        <g id="forwardTag">
          <rect id="forwardBg" x="330" y="112" width="100" height="20" rx="10" fill="#15803d" opacity="0.9" />
          <text id="forwardText" x="380" y="123" class="label-box" font-size="11">Moving forward</text>
        </g>
      </g>

      
      <g id="sunGroup">
        
        <circle cx="250" cy="185" r="52" fill="#f59e0b" opacity="0.3" filter="url(#sunGlow)" />
        <circle cx="250" cy="185" r="42" fill="#fbbf24" stroke="#f59e0b" stroke-width="3" />
        
        
        <circle cx="237" cy="178" r="4" fill="#78350f" />
        <circle cx="263" cy="178" r="4" fill="#78350f" />
        
        <path d="M 238 191 Q 250 203 262 191" stroke="#78350f" stroke-width="3" stroke-linecap="round" fill="none" />
        
        <circle cx="232" cy="186" r="4" fill="#f87171" opacity="0.6" />
        <circle cx="268" cy="186" r="4" fill="#f87171" opacity="0.6" />

        
        <rect x="175" y="240" width="150" height="22" rx="11" fill="#b45309" opacity="0.95" />
        <text x="250" y="252" class="label-box" font-size="11">Huge Mass = Strong Pull</text>
      </g>

      
      <g id="earthGroup" transform="translate(380, 185)">
        
        <circle cx="0" cy="0" r="16" fill="#38bdf8" stroke="#0284c7" stroke-width="2" />
        
        <circle cx="-4" cy="-4" r="7" fill="#4ade80" clip-path="url(#earthClip)" />
        <path d="M 4 2 Q 8 6 3 10 Q -1 6 4 2" fill="#4ade80" />
        
        <circle cx="-4" cy="-5" r="3" fill="#ffffff" opacity="0.5" />
      </g>
    </svg>
  </div>

  <script>
    const CX = 250;
    const CY = 185;
    const ORBIT_R = 130;
    const SPEED = 0.015;

    let gravityOn = true;
    let angle = 0;
    let posX = CX + ORBIT_R;
    let posY = CY;
    let velX = 0;
    let velY = -SPEED * ORBIT_R;

    const toggleBtn = document.getElementById('toggleBtn');
    const btnIcon = document.getElementById('btnIcon');
    const btnText = document.getElementById('btnText');
    const earthGroup = document.getElementById('earthGroup');
    const gravityGroup = document.getElementById('gravityGroup');
    const gravityLine = document.getElementById('gravityLine');
    const gravityBg = document.getElementById('gravityBg');
    const gravityText = document.getElementById('gravityText');
    const forwardLine = document.getElementById('forwardLine');
    const forwardBg = document.getElementById('forwardBg');
    const forwardText = document.getElementById('forwardText');
    const orbitPath = document.getElementById('orbitPath');

    function updatePositions() {
      if (gravityOn) {
        angle += SPEED;
        posX = CX + ORBIT_R * Math.cos(angle);
        posY = CY + ORBIT_R * Math.sin(angle);
        
        // Tangent unit direction: (-sin(angle), cos(angle))
        const tx = -Math.sin(angle);
        const ty = Math.cos(angle);
        
        velX = tx * 2;
        velY = ty * 2;

        // Position Earth
        earthGroup.setAttribute('transform', `translate(${posX}, ${posY})`);

        // Gravity pull arrow: pointing towards Sun (CX, CY)
        const dx = CX - posX;
        const dy = CY - posY;
        const dist = Math.hypot(dx, dy);
        const uGx = dx / dist;
        const uGy = dy / dist;

        const startX = posX + uGx * 18;
        const startY = posY + uGy * 18;
        const endX = posX + uGx * 65;
        const endY = posY + uGy * 65;

        gravityLine.setAttribute('x1', startX);
        gravityLine.setAttribute('y1', startY);
        gravityLine.setAttribute('x2', endX);
        gravityLine.setAttribute('y2', endY);

        // Position Gravity Text Tag
        const midGX = (startX + endX) / 2;
        const midGY = (startY + endY) / 2 - 14;
        gravityBg.setAttribute('x', midGX - 66);
        gravityBg.setAttribute('y', midGY - 10);
        gravityText.setAttribute('x', midGX);
        gravityText.setAttribute('y', midGY);

        // Forward velocity arrow: tangent to circle
        const fEndX = posX + tx * 45;
        const fEndY = posY + ty * 45;
        forwardLine.setAttribute('x1', posX + tx * 18);
        forwardLine.setAttribute('y1', posY + ty * 18);
        forwardLine.setAttribute('x2', fEndX);
        forwardLine.setAttribute('y2', fEndY);

        // Position Forward Text Tag
        const midFX = posX + tx * 60;
        const midFY = posY + ty * 60;
        forwardBg.setAttribute('x', midFX - 50);
        forwardBg.setAttribute('y', midFY - 10);
        forwardText.setAttribute('x', midFX);
        forwardText.setAttribute('y', midFY);

        gravityGroup.style.display = 'block';
        orbitPath.style.opacity = '0.65';
      } else {
        // Gravity is OFF -> Straight line motion
        posX += velX;
        posY += velY;
        earthGroup.setAttribute('transform', `translate(${posX}, ${posY})`);

        // Forward arrow points along constant velocity
        const len = Math.hypot(velX, velY);
        const ux = velX / len;
        const uy = velY / len;

        forwardLine.setAttribute('x1', posX + ux * 18);
        forwardLine.setAttribute('y1', posY + uy * 18);
        forwardLine.setAttribute('x2', posX + ux * 50);
        forwardLine.setAttribute('y2', posY + uy * 50);

        const midFX = posX + ux * 65;
        const midFY = posY + uy * 65;
        forwardBg.setAttribute('x', midFX - 50);
        forwardBg.setAttribute('y', midFY - 10);
        forwardText.setAttribute('x', midFX);
        forwardText.setAttribute('y', midFY);

        gravityGroup.style.display = 'none';
        orbitPath.style.opacity = '0.2';

        // Auto-loop if it flies far off screen
        if (posX < -60 || posX > 560 || posY < -60 || posY > 430) {
          posX = CX + ORBIT_R * Math.cos(angle);
          posY = CY + ORBIT_R * Math.sin(angle);
        }
      }

      requestAnimationFrame(updatePositions);
    }

    toggleBtn.addEventListener('click', () => {
      gravityOn = !gravityOn;
      if (gravityOn) {
        toggleBtn.classList.remove('off');
        btnIcon.textContent = '✓';
        btnText.textContent = 'Gravity: ON';
        // snap back into orbit at current position angle
        angle = Math.atan2(posY - CY, posX - CX);
      } else {
        toggleBtn.classList.add('off');
        btnIcon.textContent = '✕';
        btnText.textContent = 'Gravity: OFF';
      }
    });

    requestAnimationFrame(updatePositions);
  </script>
</body>
</html>

What Makes Up Our Solar System

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      width: 100%;
      background: #0b1021;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #f1f5f9;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 10px 8px;
      overflow: hidden;
      user-select: none;
    }

    /* Filter Controls */
    .controls {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      margin-bottom: 8px;
      z-index: 10;
      width: 100%;
      max-width: 680px;
    }

    .filter-btn {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.18);
      color: #94a3b8;
      font-size: 11px;
      font-weight: 600;
      padding: 5px 10px;
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.25s ease;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .filter-btn:hover {
      background: rgba(255, 255, 255, 0.16);
      color: #fff;
    }

    .filter-btn.active {
      background: rgba(34, 183, 255, 0.22);
      border-color: #22b7ff;
      color: #38bdf8;
      box-shadow: 0 0 10px rgba(34, 183, 255, 0.35);
    }

    /* SVG Canvas Container */
    .svg-container {
      width: 100%;
      max-width: 680px;
      aspect-ratio: 700 / 410;
      position: relative;
    }

    svg {
      width: 100%;
      height: 100%;
      display: block;
      overflow: visible;
    }

    /* Zone Highlighting Transitions */
    .zone-group {
      transition: opacity 0.35s ease, filter 0.35s ease;
    }

    .dimmed {
      opacity: 0.18 !important;
      filter: grayscale(80%);
    }

    .highlighted {
      opacity: 1 !important;
      filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.4));
    }

    /* Subtle orbit pulse */
    @keyframes orbitPulse {
      0%, 100% { stroke-opacity: 0.35; }
      50% { stroke-opacity: 0.7; }
    }

    .gravity-arc {
      animation: orbitPulse 4s ease-in-out infinite;
    }

    /* Comet tail shimmer */
    @keyframes cometShimmer {
      0%, 100% { opacity: 0.85; }
      50% { opacity: 0.5; }
    }

    .tail-shimmer {
      animation: cometShimmer 2.5s ease-in-out infinite;
    }

    /* Labels */
    .lbl-title {
      font-size: 11px;
      font-weight: 700;
      fill: #ffffff;
      letter-spacing: 0.3px;
    }

    .lbl-sub {
      font-size: 9.5px;
      font-weight: 500;
      fill: #94a3b8;
    }

    .lbl-tag {
      font-size: 8.5px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
  </style>
</head>
<body>

  
  <div class="controls" id="filterBar">
    <button class="filter-btn active" data-zone="all">✦ All Bound Bodies</button>
    <button class="filter-btn" data-zone="planets">🪐 8 Planets</button>
    <button class="filter-btn" data-zone="moons">🌕 Moons</button>
    <button class="filter-btn" data-zone="asteroids">🪨 Asteroids</button>
    <button class="filter-btn" data-zone="outer">☄️ Comets & Dwarf</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 700 410" xmlns="http://www.w3.org/2000/svg">
      <defs>
        
        <radialGradient id="sunGlow" cx="20%" cy="50%" r="60%">
          <stop offset="0%" stop-color="#fff7ed" />
          <stop offset="25%" stop-color="#fbbf24" />
          <stop offset="70%" stop-color="#f97316" />
          <stop offset="100%" stop-color="#7c2d12" stop-opacity="0" />
        </radialGradient>

        <radialGradient id="sunCore" cx="40%" cy="50%" r="50%">
          <stop offset="0%" stop-color="#ffffff" />
          <stop offset="40%" stop-color="#fef08a" />
          <stop offset="80%" stop-color="#f59e0b" />
          <stop offset="100%" stop-color="#ea580c" />
        </radialGradient>

        
        <linearGradient id="ionTail" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#38bdf8" stop-opacity="0.9" />
          <stop offset="40%" stop-color="#0284c7" stop-opacity="0.4" />
          <stop offset="100%" stop-color="#0369a1" stop-opacity="0" />
        </linearGradient>

        
        <linearGradient id="dustTail" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#fef08a" stop-opacity="0.75" />
          <stop offset="60%" stop-color="#fde047" stop-opacity="0.2" />
          <stop offset="100%" stop-color="#eab308" stop-opacity="0" />
        </linearGradient>

        
        <filter id="badgeBlur" x="-10%" y="-20%" width="120%" height="140%">
          <feGaussianBlur stdDeviation="2" result="blur" />
          <feComposite in="SourceGraphic" in2="blur" operator="over" />
        </filter>
      </defs>

      
      <g opacity="0.4">
        <circle cx="90" cy="40" r="0.8" fill="#fff" />
        <circle cx="140" cy="190" r="0.6" fill="#fff" />
        <circle cx="230" cy="35" r="1.1" fill="#bae6fd" />
        <circle cx="310" cy="380" r="0.7" fill="#fff" />
        <circle cx="450" cy="45" r="1" fill="#fff" />
        <circle cx="580" cy="90" r="0.9" fill="#fed7aa" />
        <circle cx="670" cy="220" r="1.2" fill="#fff" />
        <circle cx="490" cy="370" r="0.6" fill="#fff" />
        <circle cx="380" cy="18" r="0.8" fill="#fff" />
        <circle cx="620" cy="360" r="1" fill="#bae6fd" />
      </g>

      
      <g class="zone-group" id="gravity-lines" stroke="#f59e0b" stroke-dasharray="3,5" fill="none" opacity="0.3">
        <path d="M 0,205 Q 120,40 280,30" class="gravity-arc" stroke-width="1" />
        <path d="M 0,205 Q 260,80 520,60" class="gravity-arc" stroke-width="1.2" />
        <path d="M 0,205 Q 350,150 690,140" class="gravity-arc" stroke-width="1.4" />
        <path d="M 0,205 Q 300,280 670,300" class="gravity-arc" stroke-width="1.2" />
        <path d="M 0,205 Q 150,330 380,370" class="gravity-arc" stroke-width="1" />
      </g>

      
      <g id="sun-anchor">
        <circle cx="-10" cy="205" r="130" fill="url(#sunGlow)" />
        <circle cx="-10" cy="205" r="82" fill="url(#sunCore)" />
        <text x="32" y="210" class="lbl-title" font-size="13" fill="#fff" text-anchor="middle">SUN</text>
        <text x="32" y="224" class="lbl-tag" fill="#fed7aa" text-anchor="middle">Gravity Anchor</text>
      </g>

      
      
      
      <g class="zone-group" id="zone-planets">
        
        <path d="M 90,60 Q 150,205 90,350" fill="none" stroke="#475569" stroke-width="0.8" stroke-dasharray="2,3" opacity="0.5" />
        <path d="M 125,45 Q 195,205 125,365" fill="none" stroke="#475569" stroke-width="0.8" stroke-dasharray="2,3" opacity="0.5" />
        <path d="M 160,30 Q 240,205 160,380" fill="none" stroke="#38bdf8" stroke-width="1" stroke-dasharray="3,3" opacity="0.6" />
        <path d="M 195,20 Q 285,205 195,390" fill="none" stroke="#475569" stroke-width="0.8" stroke-dasharray="2,3" opacity="0.5" />

        
        <path d="M 285,10 Q 420,205 285,400" fill="none" stroke="#fbbf24" stroke-width="1.1" stroke-dasharray="3,4" opacity="0.6" />
        <path d="M 370,10 Q 530,205 370,400" fill="none" stroke="#fbbf24" stroke-width="1.1" stroke-dasharray="3,4" opacity="0.5" />
        <path d="M 445,15 Q 610,205 445,395" fill="none" stroke="#38bdf8" stroke-width="0.9" stroke-dasharray="3,4" opacity="0.5" />
        <path d="M 505,25 Q 675,205 505,385" fill="none" stroke="#38bdf8" stroke-width="0.9" stroke-dasharray="3,4" opacity="0.5" />

        
        <circle cx="140" cy="140" r="3.2" fill="#9ca3af" />
        <text x="140" y="128" class="lbl-sub" text-anchor="middle">Mercury</text>

        
        <circle cx="178" cy="165" r="5.2" fill="#eab308" />
        <text x="178" y="152" class="lbl-sub" text-anchor="middle">Venus</text>

        
        <circle cx="218" cy="205" r="6" fill="#38bdf8" />
        <circle cx="217" cy="204" r="2.2" fill="#22c55e" />
        <text x="218" y="188" class="lbl-title" font-size="10" text-anchor="middle" fill="#7dd3fc">Earth</text>

        
        <circle cx="258" cy="250" r="4.2" fill="#ef4444" />
        <text x="258" y="270" class="lbl-sub" text-anchor="middle">Mars</text>

        
        <rect x="135" y="362" width="110" height="22" rx="11" fill="rgba(249,115,22,0.15)" stroke="#f97316" stroke-width="0.8" />
        <text x="190" y="377" class="lbl-tag" fill="#fdba74" text-anchor="middle">4 Rocky Planets</text>

        
        <g transform="translate(385, 145)">
          <circle cx="0" cy="0" r="19" fill="#d97706" />
          
          <ellipse cx="0" cy="-6" rx="17.5" ry="3" fill="#b45309" opacity="0.7" />
          <ellipse cx="0" cy="4" rx="18.5" ry="3.5" fill="#fde68a" opacity="0.4" />
          <ellipse cx="0" cy="10" rx="15" ry="2.5" fill="#92400e" opacity="0.6" />
          
          <circle cx="7" cy="5" r="3" fill="#dc2626" opacity="0.8" />
          <text x="0" y="-25" class="lbl-title" text-anchor="middle">Jupiter</text>
        </g>

        
        <g transform="translate(470, 260)">
          
          <ellipse cx="0" cy="0" rx="27" ry="9" fill="none" stroke="#fef08a" stroke-width="4.5" opacity="0.6" transform="rotate(-22)" />
          <circle cx="0" cy="0" r="14" fill="#eab308" />
          
          <ellipse cx="0" cy="0" rx="27" ry="9" fill="none" stroke="#fef08a" stroke-width="4.5" opacity="0.9" stroke-dasharray="85 85" stroke-dashoffset="42" transform="rotate(-22)" />
          <text x="0" y="27" class="lbl-title" text-anchor="middle">Saturn</text>
        </g>

        
        <g transform="translate(565, 130)">
          <circle cx="0" cy="0" r="9" fill="#67e8f9" />
          <ellipse cx="0" cy="0" rx="13" ry="2" fill="none" stroke="#a5f3fc" stroke-width="1" opacity="0.7" transform="rotate(75)" />
          <text x="0" y="-15" class="lbl-sub" text-anchor="middle">Uranus</text>
        </g>

        
        <g transform="translate(625, 205)">
          <circle cx="0" cy="0" r="8.5" fill="#3b82f6" />
          <circle cx="2" cy="-2" r="7.5" fill="#1d4ed8" opacity="0.4" />
          <text x="0" y="22" class="lbl-sub" text-anchor="middle">Neptune</text>
        </g>

        
        <rect x="440" y="362" width="160" height="22" rx="11" fill="rgba(56,189,248,0.15)" stroke="#38bdf8" stroke-width="0.8" />
        <text x="520" y="377" class="lbl-tag" fill="#7dd3fc" text-anchor="middle">4 Gas &amp; Ice Giants</text>
      </g>


      
      
      
      <g class="zone-group" id="zone-moons">
        
        <ellipse cx="218" cy="205" rx="16" ry="11" fill="none" stroke="#c084fc" stroke-width="0.9" stroke-dasharray="2,2" />
        <circle cx="232" cy="198" r="2" fill="#e2e8f0" />
        <line x1="233" y1="196" x2="250" y2="175" stroke="#c084fc" stroke-width="0.9" />
        <text x="253" y="173" class="lbl-tag" fill="#d8b4fe">Moon</text>

        
        <g transform="translate(385, 145)">
          <ellipse cx="0" cy="0" rx="30" ry="11" fill="none" stroke="#c084fc" stroke-width="0.8" stroke-dasharray="2,2" opacity="0.7" transform="rotate(-15)" />
          
          <circle cx="-27" cy="7" r="1.5" fill="#fef08a" />
          <circle cx="-16" cy="-3" r="1.3" fill="#e0e7ff" />
          <circle cx="18" cy="-5" r="2" fill="#cbd5e1" />
          <circle cx="28" cy="-7" r="1.7" fill="#94a3b8" />
        </g>
        <line x1="416" y1="138" x2="445" y2="105" stroke="#c084fc" stroke-width="0.9" />
        <text x="448" y="103" class="lbl-tag" fill="#d8b4fe">Moons (Satellites)</text>
      </g>


      
      
      
      <g class="zone-group" id="zone-asteroids">
        
        <g fill="#d6d3d1" opacity="0.75">
          
          <circle cx="310" cy="65" r="1.8" />
          <circle cx="325" cy="80" r="1.2" />
          <circle cx="318" cy="95" r="2.2" />
          <circle cx="330" cy="115" r="1.5" />
          <circle cx="322" cy="135" r="1.7" />
          <circle cx="335" cy="155" r="2.5" />
          <circle cx="326" cy="175" r="1.4" />
          <circle cx="340" cy="195" r="3.2" fill="#f59e0b" /> 
          <circle cx="328" cy="215" r="1.8" />
          <circle cx="342" cy="235" r="2.1" />
          <circle cx="330" cy="255" r="1.3" />
          <circle cx="345" cy="275" r="2" />
          <circle cx="332" cy="295" r="1.6" />
          <circle cx="348" cy="315" r="2.4" />
          <circle cx="336" cy="335" r="1.5" />
          <circle cx="325" cy="355" r="1.9" />
          <circle cx="315" cy="375" r="1.2" />
          
          <circle cx="320" cy="110" r="0.9" />
          <circle cx="338" cy="140" r="1" />
          <circle cx="322" cy="225" r="1.1" />
          <circle cx="336" cy="265" r="0.9" />
          <circle cx="342" cy="180" r="1" />
        </g>

        
        <line x1="340" y1="195" x2="340" y2="40" stroke="#f59e0b" stroke-width="0.8" stroke-dasharray="2,2" />
        <rect x="270" y="24" width="138" height="20" rx="10" fill="rgba(245,158,11,0.2)" stroke="#f59e0b" stroke-width="0.9" />
        <text x="339" y="38" class="lbl-tag" fill="#fde68a" text-anchor="middle">Asteroid Belt</text>
      </g>


      
      
      
      <g class="zone-group" id="zone-outer">
        
        <path d="M 520,380 Q 640,310 680,240" fill="none" stroke="#ec4899" stroke-width="1.1" stroke-dasharray="3,3" />
        <g transform="translate(665, 260)">
          <circle cx="0" cy="0" r="3.2" fill="#f472b6" />
          <line x1="2" y1="2" x2="16" y2="18" stroke="#ec4899" stroke-width="0.8" />
          <text x="18" y="28" class="lbl-sub" fill="#f472b6">Pluto (Dwarf)</text>
        </g>

        
        <g transform="translate(540, 68)">
          
          <path d="M 0,0 Q 65,15 110,48 Q 65,30 0,0" fill="url(#dustTail)" class="tail-shimmer" />

          
          <polygon points="0,-1 115,-10 115,-3 0,1" fill="url(#ionTail)" />

          
          <circle cx="0" cy="0" r="7.5" fill="#38bdf8" opacity="0.4" />
          <circle cx="0" cy="0" r="4.5" fill="#a5f3fc" opacity="0.8" />
          <circle cx="0" cy="0" r="2.2" fill="#ffffff" />

          
          <text x="-5" y="-12" class="lbl-title" font-size="10.5" fill="#67e8f9" text-anchor="end">Icy Comet</text>
          <text x="118" y="-7" class="lbl-tag" fill="#38bdf8">Ion Tail →</text>
          <text x="115" y="52" class="lbl-tag" fill="#fde047">Dust Tail ⤵</text>
        </g>
      </g>
    </svg>
  </div>

  <script>
    // Tab Highlighting Logic
    const buttons = document.querySelectorAll('.filter-btn');
    const zonePlanets = document.getElementById('zone-planets');
    const zoneMoons = document.getElementById('zone-moons');
    const zoneAsteroids = document.getElementById('zone-asteroids');
    const zoneOuter = document.getElementById('zone-outer');

    const zones = {
      planets: zonePlanets,
      moons: zoneMoons,
      asteroids: zoneAsteroids,
      outer: zoneOuter
    };

    function setFilter(zoneKey) {
      buttons.forEach(btn => {
        btn.classList.toggle('active', btn.dataset.zone === zoneKey);
      });

      if (zoneKey === 'all') {
        Object.values(zones).forEach(el => {
          el.classList.remove('dimmed', 'highlighted');
        });
      } else {
        Object.entries(zones).forEach(([key, el]) => {
          if (key === zoneKey) {
            el.classList.remove('dimmed');
            el.classList.add('highlighted');
          } else {
            el.classList.remove('highlighted');
            el.classList.add('dimmed');
          }
        });
      }
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        setFilter(btn.dataset.zone);
      });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-select: none;
    }
    body {
      background: #0f172a;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      min-height: auto;
      padding: 10px 8px;
      overflow-x: hidden;
    }
    .space-stage {
      width: 100%;
      max-width: 600px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }
    .orbit-line {
      fill: none;
      stroke: rgba(255, 255, 255, 0.16);
      stroke-width: 1.2;
      stroke-dasharray: 4 4;
      transition: stroke 0.3s ease, stroke-width 0.3s ease;
    }
    .orbit-line.active {
      stroke: #38bdf8;
      stroke-width: 2.5;
      stroke-dasharray: none;
      filter: drop-shadow(0 0 3px #0284c7);
    }
    .sun-glow {
      animation: pulseGlow 3.5s ease-in-out infinite alternate;
      transform-origin: 0px 155px;
    }
    @keyframes pulseGlow {
      0% { opacity: 0.8; }
      100% { opacity: 1; }
    }
    .comet-glow {
      animation: cometTail 2.5s ease-in-out infinite alternate;
    }
    @keyframes cometTail {
      0% { opacity: 0.65; }
      100% { opacity: 1; }
    }
    .planet-btn {
      cursor: pointer;
    }
    .planet-btn:hover circle,
    .planet-btn:hover ellipse,
    .planet-btn:hover polygon {
      filter: brightness(1.25) drop-shadow(0 0 6px rgba(255, 255, 255, 0.85));
    }
    .label {
      font-size: 14px;
      font-weight: 700;
      fill: #f8fafc;
      text-anchor: middle;
      pointer-events: none;
      paint-order: stroke fill;
      stroke: #0f172a;
      stroke-width: 3px;
      stroke-linejoin: round;
    }
    .tag-label {
      font-size: 11.5px;
      font-weight: 800;
      letter-spacing: 0.6px;
      text-anchor: middle;
      text-transform: uppercase;
      paint-order: stroke fill;
      stroke: #0f172a;
      stroke-width: 2.5px;
    }
    .info-pill {
      margin-top: 10px;
      width: 100%;
      max-width: 580px;
      padding: 8px 14px;
      background: rgba(30, 41, 59, 0.95);
      border: 1px solid rgba(148, 163, 184, 0.35);
      border-radius: 12px;
      font-size: 13.5px;
      line-height: 1.4;
      color: #e2e8f0;
      text-align: center;
      min-height: 38px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      transition: border-color 0.3s ease, background 0.3s ease;
    }
    .info-pill strong {
      color: #38bdf8;
      margin-right: 4px;
    }

    @media (max-width: 400px) {
      body {
        padding: 6px 4px;
      }
      .label {
        font-size: 13.5px;
        stroke-width: 2.5px;
      }
      .tag-label {
        font-size: 10.5px;
      }
      .info-pill {
        font-size: 12.5px;
        padding: 6px 10px;
        min-height: 34px;
      }
    }
  </style>
</head>
<body>

  <div class="space-stage">
    <svg viewBox="0 0 600 310">
      <defs>
        
        <radialGradient id="sunGlow" cx="0%" cy="50%" r="80%">
          <stop offset="0%" stop-color="#fffbeb" />
          <stop offset="30%" stop-color="#f59e0b" />
          <stop offset="70%" stop-color="#ea580c" stop-opacity="0.8" />
          <stop offset="100%" stop-color="#ea580c" stop-opacity="0" />
        </radialGradient>

        
        <linearGradient id="cometGrad" x1="100%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#67e8f9" stop-opacity="0.95" />
          <stop offset="50%" stop-color="#38bdf8" stop-opacity="0.5" />
          <stop offset="100%" stop-color="#0284c7" stop-opacity="0" />
        </linearGradient>

        
        <linearGradient id="saturnRing" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#fed7aa" stop-opacity="0.95" />
          <stop offset="50%" stop-color="#ca8a04" stop-opacity="0.4" />
          <stop offset="100%" stop-color="#fed7aa" stop-opacity="0.85" />
        </linearGradient>
      </defs>

      
      <g fill="#ffffff" opacity="0.45">
        <circle cx="35" cy="35" r="1" />
        <circle cx="110" cy="55" r="1.3" />
        <circle cx="180" cy="25" r="0.9" />
        <circle cx="260" cy="45" r="1.4" />
        <circle cx="340" cy="30" r="1" />
        <circle cx="430" cy="50" r="1.2" />
        <circle cx="540" cy="35" r="1.1" />
        <circle cx="585" cy="85" r="1.3" />
        <circle cx="85" cy="275" r="1" />
        <circle cx="195" cy="290" r="1.4" />
        <circle cx="310" cy="280" r="0.9" />
        <circle cx="460" cy="265" r="1.3" />
        <circle cx="570" cy="250" r="1" />
      </g>

      
      <g opacity="0.9">
        <path d="M 50 18 L 180 18" stroke="#f59e0b" stroke-width="2" stroke-opacity="0.6" stroke-linecap="round" />
        <text x="115" y="13" fill="#fbbf24" class="tag-label">Inner Rocky</text>

        <path d="M 240 18 L 565 18" stroke="#38bdf8" stroke-width="2" stroke-opacity="0.6" stroke-linecap="round" />
        <text x="402" y="13" fill="#38bdf8" class="tag-label">Outer Gas &amp; Ice Giants</text>
      </g>

      
      <path id="orbit-mercury" class="orbit-line" d="M 0 101 A 54 54 0 0 1 0 209" />
      <path id="orbit-venus" class="orbit-line" d="M 0 65 A 90 90 0 0 1 0 245" />
      <path id="orbit-earth" class="orbit-line" d="M 0 25 A 130 130 0 0 1 0 285" />
      <path id="orbit-mars" class="orbit-line" d="M 0 -15 A 170 170 0 0 1 0 325" />
      
      
      <path d="M 0 -45 A 200 200 0 0 1 0 355" fill="none" stroke="#64748b" stroke-width="14" stroke-opacity="0.22" stroke-dasharray="2 6" />
      <path id="orbit-asteroids" class="orbit-line" d="M 0 -45 A 200 200 0 0 1 0 355" />

      
      <path id="orbit-jupiter" class="orbit-line" d="M 0 -105 A 260 260 0 0 1 0 415" />
      <path id="orbit-saturn" class="orbit-line" d="M 0 -190 A 345 345 0 0 1 0 500" />
      <path id="orbit-uranus" class="orbit-line" d="M 0 -280 A 435 435 0 0 1 0 590" />
      <path id="orbit-neptune" class="orbit-line" d="M 0 -370 A 525 525 0 0 1 0 680" />

      
      <path id="orbit-comet" d="M 560 65 Q 270 95 165 295" fill="none" stroke="#22d3ee" stroke-width="1.3" stroke-opacity="0.4" stroke-dasharray="4 4" />

      
      <g class="planet-btn" data-name="Comet" data-desc="An icy celestial body with a glowing tail of gas and dust as it nears the Sun." transform="translate(375, 88)">
        <polygon points="0,0 65,-20 40,-2" fill="url(#cometGrad)" class="comet-glow" />
        <circle cx="0" cy="0" r="4.5" fill="#e0f2fe" filter="drop-shadow(0 0 4px #38bdf8)" />
        <text x="0" y="19" class="label" fill="#a5f3fc">Comet</text>
      </g>

      
      <g class="planet-btn sun-glow" data-name="Sun" data-desc="The bright, glowing star at the center holding all solar system orbits with its immense gravity." transform="translate(0, 155)">
        <circle cx="0" cy="0" r="58" fill="url(#sunGlow)" />
        <circle cx="0" cy="0" r="30" fill="#fbbf24" filter="drop-shadow(0 0 12px #f59e0b)" />
        <text x="25" y="5" class="label" fill="#ffffff" font-weight="800">Sun</text>
      </g>

      
      <g class="planet-btn" data-name="Mercury" data-desc="Smallest and closest planet to the Sun; heavily cratered with no atmosphere." transform="translate(54, 155)">
        <circle cx="0" cy="0" r="5.5" fill="#94a3b8" />
        <text x="0" y="20" class="label">Mercury</text>
      </g>

      
      <g class="planet-btn" data-name="Venus" data-desc="Hottest planet in the solar system, surrounded by thick, toxic carbon dioxide clouds." transform="translate(90, 142)">
        <circle cx="0" cy="0" r="8" fill="#fbbf24" />
        <text x="0" y="-16" class="label">Venus</text>
      </g>

      
      <g class="planet-btn" data-name="Earth" data-desc="Our home planet, with liquid surface water, life, and 1 natural Moon." transform="translate(130, 168)">
        <circle cx="0" cy="0" r="8.5" fill="#38bdf8" />
        <circle cx="3" cy="-2" r="3.2" fill="#22c55e" opacity="0.85" />
        
        <circle cx="13" cy="-7" r="2.2" fill="#f1f5f9" />
        <text x="0" y="23" class="label">Earth</text>
      </g>

      
      <g class="planet-btn" data-name="Mars" data-desc="The Red Planet, with dusty iron-rich soil, polar ice caps, and thin atmosphere." transform="translate(170, 142)">
        <circle cx="0" cy="0" r="6.5" fill="#f97316" />
        <text x="0" y="-16" class="label">Mars</text>
      </g>

      
      <g class="planet-btn" data-name="Asteroid Belt" data-desc="A ring of thousands of rocky chunks orbiting between Mars and Jupiter." transform="translate(200, 155)">
        <g fill="#cbd5e1" opacity="0.9">
          <circle cx="0" cy="-55" r="2" />
          <circle cx="2" cy="-35" r="2.4" />
          <circle cx="-3" cy="-18" r="1.8" />
          <circle cx="1" cy="0" r="2.2" />
          <circle cx="-2" cy="20" r="2.5" />
          <circle cx="3" cy="42" r="2" />
          <circle cx="-1" cy="62" r="2.2" />
        </g>
        <text x="0" y="85" class="label" fill="#cbd5e1">Asteroid Belt</text>
      </g>

      
      <g class="planet-btn" data-name="Jupiter" data-desc="The largest planet: a giant gas planet with colorful bands and a Great Red Spot storm." transform="translate(260, 165)">
        <circle cx="0" cy="0" r="20" fill="#ea580c" />
        
        <ellipse cx="0" cy="-5" rx="19" ry="3.2" fill="#fed7aa" opacity="0.65" />
        <ellipse cx="0" cy="4" rx="19.5" ry="3.5" fill="#c2410c" opacity="0.75" />
        <circle cx="8" cy="8" r="3.2" fill="#b91c1c" />
        <text x="0" y="36" class="label">Jupiter</text>
      </g>

      
      <g class="planet-btn" data-name="Saturn" data-desc="A giant gas planet famous for its bright, broad rings made of ice and rock particles." transform="translate(345, 145)">
        
        <ellipse cx="0" cy="0" rx="32" ry="8.5" fill="url(#saturnRing)" transform="rotate(-20)" />
        
        <circle cx="0" cy="0" r="16" fill="#fde047" />
        
        <path d="M -30 10 A 32 8.5 0 0 0 30 -10" fill="none" stroke="#fef08a" stroke-width="3" opacity="0.9" transform="rotate(-20)" />
        <text x="0" y="-26" class="label">Saturn</text>
      </g>

      
      <g class="planet-btn" data-name="Uranus" data-desc="An ice giant planet that rotates on its side, surrounded by faint narrow rings." transform="translate(435, 168)">
        <circle cx="0" cy="0" r="12" fill="#67e8f9" />
        <ellipse cx="0" cy="0" rx="17" ry="3.5" fill="none" stroke="#a5f3fc" stroke-width="1.3" opacity="0.65" transform="rotate(75)" />
        <text x="0" y="30" class="label">Uranus</text>
      </g>

      
      <g class="planet-btn" data-name="Neptune" data-desc="The outermost ice giant planet: cold, dark, and whipped by supersonic solar system winds." transform="translate(525, 148)">
        <circle cx="0" cy="0" r="11.5" fill="#2563eb" />
        <ellipse cx="0" cy="0" rx="11" ry="2.2" fill="#60a5fa" opacity="0.45" />
        <text x="0" y="-22" class="label">Neptune</text>
      </g>
    </svg>

    <div class="info-pill" id="infoPill">
      <span>✦ Tap any planet or celestial object to explore</span>
    </div>
  </div>

  <script>
    const infoPill = document.getElementById('infoPill');
    const planets = document.querySelectorAll('.planet-btn');
    const orbits = {
      'Mercury': document.getElementById('orbit-mercury'),
      'Venus': document.getElementById('orbit-venus'),
      'Earth': document.getElementById('orbit-earth'),
      'Mars': document.getElementById('orbit-mars'),
      'Asteroid Belt': document.getElementById('orbit-asteroids'),
      'Jupiter': document.getElementById('orbit-jupiter'),
      'Saturn': document.getElementById('orbit-saturn'),
      'Uranus': document.getElementById('orbit-uranus'),
      'Neptune': document.getElementById('orbit-neptune'),
      'Comet': document.getElementById('orbit-comet'),
      'Sun': null
    };

    let activeOrbit = null;

    planets.forEach(btn => {
      btn.addEventListener('click', () => {
        const name = btn.getAttribute('data-name');
        const desc = btn.getAttribute('data-desc');

        // Update Info Text
        infoPill.innerHTML = `<span><strong>${name}:</strong> ${desc}</span>`;
        infoPill.style.borderColor = '#38bdf8';

        // Highlight matching orbit line
        if (activeOrbit) {
          activeOrbit.classList.remove('active');
        }
        if (orbits[name]) {
          orbits[name].classList.add('active');
          activeOrbit = orbits[name];
        } else {
          activeOrbit = null;
        }
      });
    });
  </script>
</body>
</html>

science.ks3.y1.t4.s1

Aligned learning resources

Related diagrams