[MUSIC] Joan Cartan-Hansen, Host: We live in the Milky Way Galaxy, but what is a galaxy?

A galaxy is a collection of hundreds of billions of stars and other space bodies, like planets, asteroids, all held together by gravity.

Gravity pulls these objects into groups, and all the groups make up what we call a galaxy.

The universe is full of galaxies!

But how does a galaxy form?

Well, scientists aren't exactly sure, but they have one big advantage that helps them find out more.

When we look into space, we are actually looking backwards through time.

That's because the light we see takes time to travel through space and reach us here on Earth.

So, scientists can look into space and see galaxies in various stages of formation.

And by observing these galaxies, scientists can get a clearer picture of how galaxies form, grow, and even die.

Recently, astronomers discovered a galaxy that has failed to form a star or is in the process of developing a star.

Discoveries like this will help scientists understand how galaxies form.

For more information about galaxies, check out the Science Trek website!

You'll find it at science trek dot org.