What is dark matter dark matter
Should be called
Invisible matter its matter that doesn't interact with light or with any other
Charged particles matter that has nothing to do with light. That's the point. How do we know that Dark Matter?
Exists. Well, we don't see it in the earth or the solar system
You have to look at big
scales before dark matter really starts to reveal itself and we stop first in the
1930s with the motions of galaxies inside of galaxy clusters
They the galaxies were just moving way too fast. The galaxy cluster should have ripped itself apart billions of years ago, but there was still
Existing so something had to be gluing all those galaxies
even our own galaxy the Milky Way just shouldn't be here then in the
1970s we discovered that stars are again moving way too fast
there has to be an extra source of
Gravity to hold the stars in and this source of gravity can't come from something
We see like stars or nebulae or anything else that glows
Otherwise we would have seen it we would have accounted for it. There is something inside of galaxies
There is something inside of galaxy clusters that has mass that has gravity but isn't emitting any light
since the 1970s we've gone even further to solidify our
Understanding of dark that we know it exists from the earliest moments of the universe. We have the Cosmic Microwave Background
this is leftover light from when the universe was just
380,000 years old and by studying tiny little
Variations in that light we can get a picture a map of what the universe was like back then and guess what?
There was a lot of matter back then that didn't interact with light
So we have all these different pieces of evidence then all fit together and all point to dark matter
Very likely dark matter or invisible matter is streaming through the room you're in right now
But it doesn't interact with light doesn't interact with charged particles. It doesn't interact with normal matter. So you just don't see it
You just don't care about it's invisible to you
But at the very largest scales it affects how things move what we do know for sure
Is that the dark matter does?
exist
