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Astronomy

The Dynamics of the Local Group and Its Galaxies

Quick fact

The Andromeda Galaxy is approaching the Milky Way at about 110 kilometers per second, and despite the universe's expansion, the two are gravitationally bound and will eventually merge—likely in about 4 to 5 billion years.

Why this is interesting

You've likely heard that the universe is expanding, but some galaxies are moving toward each other—and our Milky Way and Andromeda are on a collision course. Why don't they just drift apart?

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The Dynamics of the Local Group and Its Galaxies

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