These other solar systems may also have planets as a part of them. Current data indicates that there is a very dense 'point mass' at the center of our galaxy, containing mass up to 1 million times the mass of our sun. This indicates that there is probably a black hole located there. I need to ask a scientist what she thinks is a very interesting fact about galaxies for my first grade class project. I know stars like to live in cites called galaxies.
Gravity is important.
And galaxies come in 3 shapes. Do you know any other real i mportant facts about galaxies. All the galaxies are moving through space away from each other. I think the most interesting thing about galaxies is that there are SO many of them, and they move SO fast. It's hard to imagine such huge numbers.