Big question for physicists out there:How can we be sure dark matter actually exists in our universe?

We can see the bright matter, like stars, but we know some other matter is there(dark matter)because of how it pulls on the bright matter.

Explanation:

11 players on a field that has a maximum of 11 players

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.