5 ms·
It's almost all Hydrogen/Helium gas. Other larger atoms and molecules are known to exist in the interstellar medium, but it's primary gas. Also, a good way to
by semaphoreP 10y ago
It's almost all Hydrogen/Helium gas. Other larger atoms and molecules are known to exist in the interstellar medium, but it's primary gas.
Also, a good way to remember the density is ~1 Hydrogen atom per cm^3.
- infogulch 10y agoHow about intergalactic densities?
- semaphoreP 10y agoDon't know the number off the top of my head, but it should be considerably less. It should also be highly varying as some galaxies live in pretty densely packed environments (galaxy clusters), which some live in very open environments like our own galaxy.
- infogulch 10y agoNothing like a little "look it up yo damn self": Looks like it's about 1 hydrogen per m^3 [1] (via SO [2]), about 1 million times less dense. Damn. [1]: http://www.universetoday.com/30280/intergalactic-space/ [2]: http://physics.stackexchange.com/questions/25378/how-vacuous-is-intergalactic-space/25379#25379
- ar15saveslives 10y agoWe could catch it and use as a fuel or recoil mass! (does napkin math) Nope :-(