Question

the ______ is locked into a gravitational pull with our milky way, so both are actually orbiting each other and slowly closing the gap between the them.
kepler - 22
andromeda galaxy
psr b1620 - 26 b
proxima - b

Explanation:

The Andromeda galaxy is in a mutual - gravitational orbit with the Milky Way and they are approaching each other. Kepler - 22 is a star, PSR B1620 - 26 b is a planet, and Proxima - b is also a planet. None of these other options are galaxies in a gravitational pull with the Milky Way like Andromeda.

Answer:

Andromeda galaxy