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Why do galaxies collide
Why are distant galaxies not visible in the observable Universe?Why can't we determine the center of the universeWhy are explosions always used to represent the Big Bang?Why did the big bang not just produce a big black hole?How do we know the big bang expanded space and not the other way around?How do we get radio signals of the big bang?Question about space-timeSecond Big BangWas the whole Universe close to Big Bang very small, or just very dense?Is it fruitful to search for a correlation between rates of in-falling matter in black holes and the expansion rate of our universe?
$begingroup$
If the universe is expanding outward, what is the processes for one galaxy to get off track enough to collide with another? Say, Andromeda and the Milky Way.
big-bang-theory
asked 2 hours ago
DaveDave
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add a comment |
$begingroup$
If the universe is expanding outward, what is the processes for one galaxy to get off track enough to collide with another? Say, Andromeda and the Milky Way.
big-bang-theory
asked 2 hours ago
DaveDave
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago
add a comment |
$begingroup$
If the universe is expanding outward, what is the processes for one galaxy to get off track enough to collide with another? Say, Andromeda and the Milky Way.
big-bang-theory
asked 2 hours ago
DaveDave
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
If the universe is expanding outward, what is the processes for one galaxy to get off track enough to collide with another? Say, Andromeda and the Milky Way.
big-bang-theory
big-bang-theory
asked 2 hours ago
DaveDave
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
DaveDave
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
DaveDave
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
DaveDave
111
asked 2 hours ago
DaveDave
111
111
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Dave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago
add a comment |
1
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago
1
1
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
The universe is expanding on a large scale. But locally things are always messy.
Locally, galaxies are not set in stone, they move relative to each other, and the directions are random. If they're moving towards each other fast enough, then they will collide.
Also, there's gravity. Some galaxies are bound to each other by gravity, and that will tend to pull them together.
As to why galaxies move at all, relative to each other - well, things in this universe have kinetic energy, and it's distributed randomly. Being distributed randomly, all kinds of scenarios are possible - things running away from each other, zooming past each other, bumping into each other, etc.
It's a messy and random universe, and the order of expansion becomes apparent only on the largest scale.
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
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1 Answer
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$begingroup$
The universe is expanding on a large scale. But locally things are always messy.
Locally, galaxies are not set in stone, they move relative to each other, and the directions are random. If they're moving towards each other fast enough, then they will collide.
Also, there's gravity. Some galaxies are bound to each other by gravity, and that will tend to pull them together.
As to why galaxies move at all, relative to each other - well, things in this universe have kinetic energy, and it's distributed randomly. Being distributed randomly, all kinds of scenarios are possible - things running away from each other, zooming past each other, bumping into each other, etc.
It's a messy and random universe, and the order of expansion becomes apparent only on the largest scale.
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
$endgroup$
add a comment |
$begingroup$
The universe is expanding on a large scale. But locally things are always messy.
Locally, galaxies are not set in stone, they move relative to each other, and the directions are random. If they're moving towards each other fast enough, then they will collide.
Also, there's gravity. Some galaxies are bound to each other by gravity, and that will tend to pull them together.
As to why galaxies move at all, relative to each other - well, things in this universe have kinetic energy, and it's distributed randomly. Being distributed randomly, all kinds of scenarios are possible - things running away from each other, zooming past each other, bumping into each other, etc.
It's a messy and random universe, and the order of expansion becomes apparent only on the largest scale.
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
$endgroup$
add a comment |
$begingroup$
The universe is expanding on a large scale. But locally things are always messy.
Locally, galaxies are not set in stone, they move relative to each other, and the directions are random. If they're moving towards each other fast enough, then they will collide.
Also, there's gravity. Some galaxies are bound to each other by gravity, and that will tend to pull them together.
As to why galaxies move at all, relative to each other - well, things in this universe have kinetic energy, and it's distributed randomly. Being distributed randomly, all kinds of scenarios are possible - things running away from each other, zooming past each other, bumping into each other, etc.
It's a messy and random universe, and the order of expansion becomes apparent only on the largest scale.
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
$endgroup$
The universe is expanding on a large scale. But locally things are always messy.
Locally, galaxies are not set in stone, they move relative to each other, and the directions are random. If they're moving towards each other fast enough, then they will collide.
Also, there's gravity. Some galaxies are bound to each other by gravity, and that will tend to pull them together.
As to why galaxies move at all, relative to each other - well, things in this universe have kinetic energy, and it's distributed randomly. Being distributed randomly, all kinds of scenarios are possible - things running away from each other, zooming past each other, bumping into each other, etc.
It's a messy and random universe, and the order of expansion becomes apparent only on the largest scale.
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
answered 59 mins ago
Florin AndreiFlorin Andrei
13.3k13046
13.3k13046
add a comment |
add a comment |
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1
$begingroup$
This is a very little bit like asking why do molecules in an expanding cloud of gas collide.
$endgroup$
– uhoh
1 hour ago