How Does The Power of the Redshift - Ask a Spaceman! Work?

The Redshift works like a stretchy rubber band that tells us how far away something is in space.

Imagine you're on a playground swing, and your friend is pushing you. Every time they push, you go higher, just like redshift helps scientists see how far away stars and galaxies are. When a star moves away from us, the light it sends out stretches out as it travels through space, making the colors look more reddish, which is why we call it redshift.

Think of a rubber band. If you pull it tight, it's short and bouncy, like light from something that’s close to us. But if you stretch it out slowly, it becomes longer and less bouncy, just like redshift when something is moving away. The more stretched the rubber band is, the farther away we know the object must be.

When scientists look at galaxies far away, they see this red stretchy effect in the light from those galaxies. It's like seeing a friend on the swing who’s going higher and higher, you know they're moving away, just like stars are moving away from us through space!