Nebulas

[dav2008]

Or is it Nebulae...anyways

What is the density in atoms per unit volume of most nebulas? Im just looking for a rough estimate to help me picture it..

And what would it look like if u were inside one..would u even see anything?

[Phobos]

Good question with an interesting answer.
excerpt from http://itss.raytheon.com/cafe/qadir/q1929.html

"density of only a few hundred atoms per cubic centimeter, most nebula are better then the best vacua we can make on the earth"