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Ambitwistor
#2
Nov25-03, 08:30 PM
P: 837
I'm curious to know the atomic/molecular composition of outer space, excluding the celestial bodies suspended within it and theoretical "dark matter".
The interstellar medium is about 75% hydrogen gas, 25% helium gas, and 1% dust.

http://www-ssg.sr.unh.edu/tof/Outrea...tml?what1.html

I'm also interested in knowing the approximate temperature of space that isn't being affected by a star or other nearby body, or if measurements like that have even been taken.
Presently, it is 2.725±0.002 degrees above absolute zero, the temperature of the cosmic microwave background radiation.