If everything in the universe is moving away from each other at the same rate, how do galaxies collide?
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answers:
Dimitry say: Because galaxies witch are very close together attract each other gravitationally,counteracting the repulsive force of the expanding universe
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Jeremy Auldaney say: A Big Bang is not an answer to the complex design of the universe. However, everything is moving apart because God says he streatched out the universe on day on day 4 Wednesday. That motion is still going on slower and slower after he created the stars and galaxies.
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poldi2 say: Local gravity overrides the general expansion of the universe.
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..... say: By orbits out of sync with the larger planets they orbit around, a planned event over millions of years.
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Tom S say: Because "everything" is not moving away from "each other". Distant galaxies appear to be moving away from us due to the cosmological expansion of space. Galaxies which collide are obvious not "distant" to each other, but in fact gravitationally bound to each other in clusters of galaxies. Within galactic clusters the gravity between the nearby galaxies is much stronger than the force of cosmological expansion.
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Snowwie888 say: For the same reason you can say, why are you not moving away from the Earth?
Simple, local gravity is stronger than the expanding force of the Universe, even on larger scales like the local group of galaxies in which our Milky Way and the Andromeda Galaxy are pulling towards each other, overcoming even the expansion of space over a distance of 2.5 million lightyears.
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quantumclaustrophobe say: It's galactic clusters that are moving away from each other... within those clusters are groups of galaxies gravitationally bound to each other. In our case, the Milky Way is one of about 50 galaxies in the "Local Group." In about 4 billion years, Andromeda and the Milky Way will merge, in fact, and there's evidence that the both the Milky Way and Andromeda have 'swallowed' smaller galaxies in the last few billion years.
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Zardoz say: Because it isn't everything. Most of the items in your garage aren't moving away from each other.
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Sky say: Because the force of gravity is so much stronger than the force of dark energy that's making the universe expand. Here's a video that explains your exact question.
https://www.youtube.com/watch?v=2OjNokIt...
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daniel g say: Because it doesn't work like that
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