Are there other galaxies?

What is a galaxy?

How were galaxies formed?

What does a galaxy look like?

What do other types of galaxies look like?

What is Earth's galaxy like?

Are there any other galaxies close to us?

Do galaxies move?

Could two galaxies ever collide?

How can we see galaxies far away?

What is a black hole?

Could we travel through wormholes?

Could we travel to another galaxy?

Galaxy quiz.