When galaxies collide
Chapter 1
The cosmic roadmap
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Chapter 2
The physics of a smash-up
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Chapter 3
The birth of Milkomeda
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Chapter 4
Collisions across the cosmic web
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YOUR GOAL
Master of When galaxies collide
Ch 2 · The physics of a smash-up
Fun Fact
Empty space: The chance of any two individual stars physically colliding during the merger is nearly zero.
Glossary
gravity (noun)
The force that attracts a body toward any other physical body having mass. This pull draws the neighboring Andromeda galaxy toward our own at 110 kilometers per second.
The force that attracts a body toward any other physical body having mass. This pull draws the neighboring Andromeda galaxy toward our own at 110 kilometers per second.
Quiz
What are the long, stretched-out streams of stars pulled away by gravity during a merger called?
Quiz
Why are actual star-on-star collisions unlikely when Andromeda and the Milky Way merge?
Quiz
Which fundamental force is entirely responsible for pulling Andromeda and the Milky Way together?