Astronomers expect the milky way to collide with the andromeda galaxy in about 3 billion years.
a. true
b. false

Yes, it is true that astronomers expect the Milky Way to collide with the Andromeda galaxy in about 3 billion years. It is more than 3 billion years, however - more like 4, but it is still inevitably going to happen. By then, our Sun is probably going to die and destoy the Earth, but we won't be alive to see it anyways, so it doesn't really matter.

No is the answer to the question

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more