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22 votes
Accepted

Why doesn't Titan have a carbon dioxide atmosphere?

The chemistry of Titan's atmosphere is complex, with reactions occurring between carbon dioxide, oxygen, carbon monoxide, hydroxl, and other compounds. This means that carbon dioxide production and ...
HDE 226868's user avatar
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18 votes
Accepted

Are Buckyball-sized black holes possible?

A buckyball is about a nanometre ($10^{-9}$ m) across. If you limit the charge on the black hole to something like that of an electron or a few electrons, then this would mean the event horizon(s) of ...
ProfRob's user avatar
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4 votes

Why is molecular hydrogen (H2) so difficult for astronomers to detect?

There are a few reasons molecular hydrogen (H2) is hard to detect depending on what band you are looking. In the UV, it can be detected in absorption of the electronically excited Lyman–Werner bands, ...
Kyle's user avatar
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3 votes

Why is molecular hydrogen (H2) so difficult for astronomers to detect?

The light that we receive from space contains a lot of information. Specifically, because of quantum nature of molecules and atoms, theses small species absorb light at very specific wavelengths.Each ...
Shamaz's user avatar
  • 264
3 votes
Accepted

How do they know the newly-spotted gas near the center of our galaxy is molecular without knowing what gas it is?

They know there's molecular gas because they observed emission from the CO molecule in two of the previously identified (atomic-hydrogen-emitting) gas clouds. From the paper: ... we targeted two ...
Peter Erwin's user avatar
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3 votes
Accepted

Air molecules per cubic foot at a certain altitude above the surface

The kinds of molecules / atoms and the density of those molecules / atoms as a function of altitude in the Earth's upper atmosphere depends very much on the time of day and the activity of the Sun. ...
David Hammen's user avatar
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2 votes

Molecule formation when an atomic gas cools down

It depends all on the reaction rates between all the $n$ different atoms and molecules. So you need to know all the $n\times n$ reaction cross sections in order to be able to solve the $n$ equations ...
Thomas's user avatar
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1 vote

Air molecules per cubic foot at a certain altitude above the surface

Atoms are small. It's been observed that there are more molecules of water in a teaspoon, than there are teaspoons of water in all the oceans of Earth. In fact, atoms are so small that even at the ...
James K's user avatar
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