Why are galaxies colliding,if everything is moving away from each other?

Question

according to the Big Bang theory,the explosion has caused everything to move from each other,yet,one galaxy collides with another galaxy,how is that possible when they are supposed to be moving away from each other

Answer 1

When astronomers are talking about the entire universe expanding they are talking about galaxy clusters, not individual galaxies. For example, our galaxy is part of the Virgo cluster which is moving away from all the other clusters. But within the clusters, individual galaxies can be moving toward each other. As a matter of fact, we are moving toward the Andromeda galaxy and in billions and billions of years will no longer be a separate galaxy, although we will still be moving apart relative to other clusters.

Answer 2

Twizard has the best answer. It's actually not the individual galaxies that are going away from each other, but clusters of galaxies. Galaxies within one cluster are gravitationally bound to each other, and often collide.

There are about 40 galaxies in our Local Group, of which the Milky Way and the Andromeda Galaxy are the largest. Most of the others are dwarf galaxies (so-called because they are pretty tiny and contain very few stars, relatively speaking). And the Milky Way and Andromeda are indeed on a collision course!

Answer 3

It is the effect of the gravity between the two galaxies that makes them collide with time.
It is interesting to know, that distance between stars is so big that even if a collision occurs, it is not likely that any of the starts or other major objects contained in the galaxy actually crash into each other.

Answer 4

Although most galaxies are moving apart, some are not. It can be determined which galaxies are moving away from us using the Doppler effect. If the light reaching us from a galaxy is red shifted, it is moving away from us. Virtually all of them are but there are some, I think maybe 2, that are approaching us.

Answer 5

The universe is increasing. actually, everywhere the position localized garvity can not "bond" thousands at the same time, all products are "shifting away" from one yet another, or, for a more desirable sensible wording, the area between them is growing to be. yet, the area between earth and sunlight isn't increasing. that's beacuse of the gravitational consistent at the same time with the mass of earth, the mass of the daylight, and the area between them. regionally, the Small Magellanic Cloud, the tremendous Magellanic Cloud, the Andromeda Galaxy, and more than a number of alternative minor galaxies have adequate mass and are at an in intensity adequate distance to us (and for this reason gravity overrides the boom cost) that "galactic collisions" in the destiny will certainly take position. yet even as the distances are large adequate, or the thousands are sufficiently small, gravity can not counter-act the boom of the universe, so the distances between such galaxies expands. So no, no longer ALL galaxies are shifting faraway from one yet another. in elementary words those some distance adequate faraway from one yet another.

Answer 6

Galaxy recession is a large scale phenomenon. Much like when you blow a balloon, it expands but the individual molecules in the air inside can be moving past one another. In fact, galaxy collisions is far more common than you suspect, especially earlier in the evolution of the universe

Answer 7

Should be the question of the month.

It can only be that though galaxies on the whole are spreading out, locally some must affect each other with their gravity

Answer 8

Gravity between the galaxies would be shifting their trajectories ever so slightly so that they are occasionally moving towards each other.

Answer 9

google how tides are caused on Earth's oceans & you will get the answer

Answer 10

YES, PLEASE SOMEONE ANSWER THIS QUESTION..IM CURIOUS TO KNOW....I KNOW THAT THERE IS A SUSPECTED BLACK HOLE THAT IS EATING EVERYTHING ..NOW I WANT TO KNOW MORE INSIGHT..