Questions tagged [element]

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5
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1answer
288 views

Neutron stars and distribution of heavy elements

In the news, of course, is the theory that much of the mass of the heaviest elements in Earth would have come from colliding neutron stars. This graphic gives one such analysis: Origin of the ...
11
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2answers
4k views

Why argon instead of another noble gas?

I noticed that the atmospheres of Earth and Mars have a little bit of argon in them (1% to 2%). I checked Venus, too, which has 0.007% argon, but that's still more than any other noble gas in the ...
2
votes
1answer
48 views

What does oxygen on comet 67P/Churyumov-Gerasimenko mean?

Recently, the Rosetta mission found oxygen on the comet 67P/Churyumov-Gerasimenko. According to theories, oxygen should not be in the state in which it is on the comet. What are the previous theories ...
13
votes
2answers
2k views

Does any iron fuse in stars before they go supernova?

I understand that iron and all heavier elements consume more energy to produce than they make, and that is what eventually leads to a supernova. I also understand that a lot of the heavier elements ...
8
votes
2answers
6k views

Where do the heavier elements come from?

Partly inspired by this question, the end result of stellar fusion is Iron-56 (eventually, after some decay). Then it explodes. How/where then to the heavier elements come from. The answer here ...
1
vote
1answer
221 views

Where/how are metals distributed in our universe?

For one particular kind of element, what is the distribution in the whole universe? Are most of the metals located in ISM, IGM, or stars? Maybe different metals have different distributions? For ...