Posted: Dec 30, 2010 9:53 am
I'd like to add that the claim that we don't know the chemical composition of the interstellar dust is not really true at all.
Interplanetary dust particles collected from the stratosphere: physical, chemical, and mineralogical properties and implications for their sources
Identification of molecular-cloud material in interplanetary dust particles
http://en.wikipedia.org/wiki/Interplanetary_dust_cloud
Interplanetary dust particles collected from the stratosphere: physical, chemical, and mineralogical properties and implications for their sources
Identification of molecular-cloud material in interplanetary dust particles
http://en.wikipedia.org/wiki/Interplanetary_dust_cloud