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.

Answer 1

The correct response is: Astronomers have observed their movements over time.

By tracking the positions and velocities of the Milky Way and Andromeda galaxies, astronomers have been able to calculate their trajectories, which indicate that they are on a collision course and will eventually merge.