Why is dark mater only found out to a certain extent from galaxies? When galaxies collide, does dark mater ..?

Question

mix in with mater we know? Could it reach surface of planets with atmospheres? What would happen to the Physics of mater we know of then?? If not what keeps dark mater out side, or at the margin? Not to mention there is a small galaxy already binding with our galaxy, almost done though... Witch explains the high level of star formation in our Milky way with the new flow of hydrogen clouds.. (the photos of it isn't clear because we are IN the Milky way, darn!) but What a bout dark mater? What is it doing in our galaxy's case? :)

Answer 1

The Milky Way and other galaxies don't have enough mass to hold together.  Stars planets and interstellar dust isn't enough to keep it all together. This is where dark matter comes in. Nobody really knows what it is because it isn't part of the visible universe. It can be detected through gravitational lensing. Starlight actually bends around the gravity of dark matter distorting it. So pockets of dark matter can be found.

As the earth orbits the sun is plows through dust, constantly gets bombarded by radiation so there is a good chance there is dark matter right in your room along with harmless cosmic rays and other things. Dark matter is also what is thought to be expanding the universe. So, dark matter exists between galaxies. If galaxies collide so does some dark matter.

Answer 2

i have no real idea, but have a good understanding of the universe and the related physics....

if this statement is true, i would guess it has something to do with the simple fact that galaxies are collections of matter.... perhaps somehow the dark energy throughout the universe interacts with the matter of universes and makes dark matter.... dark energy is found all throughout the universe, and it makes up about 75% of the universe (dark matter only makes up 20-something%)

"The Milky Way and other galaxies don't have enough mass to hold together. Stars planets and interstellar dust isn't enough to keep it all together. This is where dark matter comes in. Nobody really knows what it is because it isn't part of the visible universe. It can be detected through gravitational lensing. Starlight actually bends around the gravity of dark matter distorting it. So pockets of dark matter can be found.

As the earth orbits the sun is plows through dust, constantly gets bombarded by radiation so there is a good chance there is dark matter right in your room along with harmless cosmic rays and other things. Dark matter is also what is thought to be expanding the universe. So, dark matter exists between galaxies. If galaxies collide so does some dark matter."

you're completely confusing dark matter and dark ENERGY

Answer 3

I have wondered this myself. I have deduced a couple things. Dark matter has gravity, this being the whole idea behind its inception, so it has mass. However I have heard that if a spaceship were to approach dark matter it would pass right through it. So, either dark matter is gaseous or it does not take up space and can pass right through regular matter.

One thing I have wondered is if dark matter has gravity than it too should be affected by the gravity of everything else via Newton's 3rd law. If this is so than why doesn't dark matter clump around other bits of dark matter or regular matter? Is there another force keeping it away and if it is somehow repelled by regular matter than matter should be equally repelled, which cannot be the case since dark matter's attractive force is what makes the galaxy move the way it does.

And on a side note NASAs Hubble telescope caught a picture of dark matter when to other galaxies collided. For some reason the energy of the collision caused the the dark matter to radiate.