Are Andromeda and Canis Major comets or asteroids?

Answer 1

The name "Andromeda" refers to a constellation, and is often used to refer to the perhaps-misnamed "Andromeda Nebula", which is actually another galaxy, called M31.

Charles Messier was a French astronomer of the late 1700s. His primary interest was in finding comets, but he kept finding things that LOOKED like comets, but turned out not to be comets. So he published his "Catalogue of Nebulae and Star Clusters" so that other would-be comet hunters would be able to easily determine that this comet-like object wasn't a comet.

It turned out that the Messier catalog included many items vastly more distant, and more interesting, than mere comets. The Andromeda Nebula, or the Andromeda Galaxy, was item #31 on Messier's list.

Canis Major is another constellation.