How do astronomers know about other galaxies?

1 Answer
Prephixa
Aug 13, 2016

Other galaxies have been observed.

Explanation:

Astronomers have for a quite long time been able to observe other galaxies with big telescopes like the Hubble telescope. The telescopes can see very very far away.
They target a light that may look like a star, and when they zoom in they see a galaxy.

Related questions
See all questions in Astronomy Basics
Impact of this question
1702 views around the world
You can reuse this answer
Creative Commons License