galaxies

A while ago I saw a documentary that explained that the velocity of the objects orbiting the center of the galaxy which are positioned on the outer rim of the galaxy, match the velocity of the objects orbiting the center of the galaxy which are positioned on the inner rim of the galaxy. I'd...

I have been into the whole space scene for about 2 years now! It’s amazing to learn something new everyday in this community but here’s a question that may be a dumb one lol. When we say the universe is expanding are we saying just the trillions of galaxies are getting further apart or are is it...