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.

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