All Questions
Tagged with fundamental-astronomy radio-astronomy
3
questions
6
votes
1
answer
325
views
How to know that the 21cm Hydrogen line is the actual emission and not any other redshifted line?
Is it possible that we mistake some other wavelength emission to be 21 cm because of redshift?
- 503
2
votes
1
answer
75
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The M-theory to understand black holes [closed]
I am a layman in astronomy. Can someone please explain it to me whether the M-theory can be used to explain what is happening in the centre of the black hole where the singularity exists? Or is it ...
- 49
2
votes
1
answer
560
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Cosmic microwave background radiation: why did it take so long to get here?
I understand that the universe after the big bang was a super dense cloud of elementary particles, and because of this high density was "not transparent" to light.
Then, roughly 400.000 years (380....
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