⚙️ how
How do galaxies merge?
SpaceGalaxies
Quick Answer
Gravity pulls galaxies together over millions to billions of years until they interact, distort, and eventually combine. Their stars usually do not collide directly because space between stars is so large.
The Full Story
When two galaxies pass near each other, tidal forces stretch them into tails and bridges, and dynamical friction gradually drains their orbital energy. Over time, the systems can coalesce into one larger galaxy, often triggering bursts of star formation. The stellar collisions are rare because galaxies are mostly empty space, but gas clouds can collide and compress. The Milky Way and Andromeda are expected to merge in about 4 to 5 billion years.
Key Facts
1.Milky Way and Andromeda are expected to merge in roughly 4–5 billion years
2.Tidal tails are a common sign of interaction
3.Gas clouds collide more readily than stars
YouTube Angle
Suggested video title for this topic:
"How two galaxies slowly become one"