How do astronomers know about the future collision of Andromeda and the Milky Way?(1 point)
Responses
The Milky Way has changed course to head toward Andromeda.
The two galaxies have collided previously.
Astronomers have observed their movements over time.
All galaxies will collide at some point.
Astronomers know about the future collision of Andromeda and the Milky Way because they have observed their movements over time.
Astronomers know about the future collision of Andromeda and the Milky Way because they have observed their movements over time.
The correct answer is: Astronomers have observed their movements over time.
Astronomers have been studying the motions and positions of galaxies in the sky for many years. They use various techniques, including spectroscopy and imaging, to measure the distances, velocities, and positions of galaxies.
By observing the movements of the Milky Way and Andromeda galaxies, astronomers have been able to determine that they are moving towards each other. They can measure their proper motions, which are the apparent motions of objects in the sky over time, and calculate their velocities and trajectories.
Through detailed observations and measurements, astronomers have determined that the Milky Way and Andromeda are on a collision course. They estimate that the two galaxies will collide in about 4.5 billion years.
This knowledge of the future collision is based on the scientific method, which involves making observations, gathering data, and drawing conclusions from the evidence gathered. Astronomers constantly monitor the movements of celestial objects to gain insights into the dynamics of the universe and predict future events like the collision of galaxies.