To what degree are stars and galaxies a part of physical space?

Question

as a percentage or ratio, does anyone have an idea

Answer 1

Let's see... let's throw some rough numbers around. Very roughly, there are about 100 billion stars in a galaxy, and there are about 100 billion galaxies in the visible universe, which is about 10 billion light years in diameter. Very crudely, we'll say that a star is about 10^-10 light years in diameter, or having a volume of 10^-30 cubic light years. So, we can work out the ratio:

Volume of visible universe = 10^30 cubic light years

Volume of all stars = 10^11 * 10^11 * 10^-30 = 10^-8 cubic light years

Density = 10^-8 / 10^30 = 10^-38

If we had just a small pebble, the empty space would be about the size of Earth's orbitt around the sun.

Answer 2

That would depend whether or not scientists decide that space is "black matter" which would have to have mass.
so if all "space" is "physical space" stars and galaxies would make up a small percentage,right?
Actually,
nobody knows the answer to this question simply because we have not discovered the boundaries of space and have no idea of its "mass".
hope this helps.. hehe

Answer 3

impossible to tell. you would need to know the exact dimension of the universe, the number of stars in every galaxy. the size of each star, number of planets, comets, asteroids, galaxies, quasars. etc etc. all matter divided by the dimension of space. would equal the percentage.

Answer 4

less than1%.

Answer 5

0.4%