Andromeda Galaxy Trivia Questions

True—Under dark skies, Andromeda appears as a smudge of light; it’s the farthest object visible without aid, about 2.5 million light-years away.

True—Charles Messier cataloged it as M31 in 1764; it’s one of the brightest Messier objects and a popular target for amateur astronomers.

False—Andromeda is actually moving toward us because its gravitational attraction overcomes cosmic expansion; most distant galaxies recede, but local ones can converge.

This is true; Andromeda is approaching us at roughly 250,000 mph, and simulations show a merger in about 4.5 billion years, though stars rarely collide.

False. Andromeda is the closest major galaxy, but it is about 2.5 million light-years away, not 25,000. The 25,000 light-year figure corresponds to nearby dwarf galaxies like the disputed Canis Major Overdensity, not a major galaxy.

True—Andromeda has an estimated one trillion stars, compared to the Milky Way's 100–400 billion, making it the local group's heavyweight.

False—The collision is more of a messy merger; stars are so sparse that few will physically crash, and most will settle into a new, larger elliptical galaxy.

True—Andromeda spans about six full Moons across, but its faint outer regions are invisible to the naked eye; only its bright core is visible.