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

Question

Responses

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

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.

The Milky Way has changed course to head toward Andromeda.

Answer 1

Astronomers know about the future collision of Andromeda and the Milky Way primarily because astronomers have observed their movements over time. By studying the velocities and trajectories of both galaxies, they can predict their paths and determine that they are on a collision course, expected to occur in about 4.5 billion years.