AI Tutor
How could you hold the whole planet Earth right in your hands?
The real Earth is much too huge to pick up, but you can easily hold a globe.
A model is a drawing, object, or mini build that stands in for something real so scientists can study it.
Why do scientists build models instead of just looking at the real world?

Three Ways to Use Models

Scientists build models for three big reasons: to show things that are too big or too tiny, to show things that change over time, or to test an idea.
What happens when you want to see how day turns into night?

Modeling How Day and Night Happen

You cannot stop the Sun in outer space, but you can shine a flashlight on a spinning ball.
The side of the ball facing the flashlight is in bright day, while the dark side facing away is in night.