Galaxy Formation Quiz

Question

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Question
How do astronomers know about the future collision of Andromeda and the Milky Way?(1 point)
Responses

Astronomers have observed their movements over time.
Astronomers have observed their movements over time.

The Milky Way has changed course to head toward Andromeda.
The Milky Way has changed course to head toward Andromeda.

The two galaxies have collided previously.
The two galaxies have collided previously.

All galaxies will collide at some point.
All galaxies will collide at some point.
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Answer 1

The correct response is:

Astronomers have observed their movements over time.

This observation allows astronomers to predict the future collision between the Milky Way and the Andromeda galaxies.