Imagine you're in a huge balloon, and you can only see the part of the balloon around you. To figure out how big the whole balloon is, you might measure how fast it's expanding or how far away other parts of the balloon are from you.
The Big Balloon
Scientists look at stars and galaxies like they're on a giant balloon, the universe. They see that everything is moving away from us, just like when you blow up a balloon. By measuring how fast things are moving apart, scientists can guess how big the whole universe might be.
Examples
- If you're on a balloon, and it's blowing up, everything else seems to move away from you, just like galaxies do in the universe.
- Imagine measuring how far your friend is by how bright their flashlight looks from across the room.
- A giant ruler made of stars helps scientists measure distances across space.
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See also
- How Do Bubbles Actually Form?
- How Do Bubbles Form and Pop?
- How Do Clouds Form and Stay in the Sky?
- How Do Flames Actually Burn?
- How Do Clouds Form and Why Do They Look Different?
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