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4 votes
0 answers
54 views

The Relationship between Surface Temperature and Mass of MS and Red Giant

The assumptions about the problem situation are as follows : The red giant is in the HB at HR disgram, and it's a helium fusion situation. And in this situation, the mass of the red giant is the ...
빛나는밤's user avatar
18 votes
2 answers
3k views

Why isn't most hydrogen in the universe molecular (diatomic), instead of atomic (monoatomic)?

Similar questions have been asked before; but, why? Is the monoatomic hydrogen left over from the Big Bang? And hasn't had the opportunity to collide with other hydrogen atoms yet? Or are hydrogen ...
Kurt Hikes's user avatar
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