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Jun
8
asked Why is the Ritchey–Chrétien telescope preferred in professional astronomy?
Jun
8
comment What are the various kinds of Cassegrain telescopes, and what benefits and drawbacks does each have?
Sorry, I should have been more clear in my question. I was only speaking about optical telescope designs (hence, Hubble, amateur telescopes). I think it is most likely safe to say that most amateurs aren't doing X-ray astronomy. :]
Jun
7
asked What are the various kinds of Cassegrain telescopes, and what benefits and drawbacks does each have?
Jun
7
accepted What is meant when it is said that the universe is homogeneous and isotropic?
Jun
7
accepted How large is the universe?
Jun
7
comment How large is the universe?
@Spencer: What I'm specifically wondering is how the faster-than-light expansion of the universe can be reconciled with Special Relativity. @dagorym tried answering partially. What I'd like to know is does Special Relativity apply in this instance and, if not, why not?
Jun
7
accepted Why are there more lunar maria on the near side than on the far side?
Jun
6
asked How large is the universe?
Jun
6
asked What is meant when it is said that the universe is homogeneous and isotropic?
Jun
6
comment Why are there more lunar maria on the near side than on the far side?
@Carson: Actually, I think community wiki for questions doesn't exist anymore. I remember someone stating that it was removed, and, anyway, I don't see an option for it. I'm not sure why, though.
Jun
6
comment What is the probability that a star of a given spectral type will have planets?
Perhaps it would be more correct to say that "all stars end up having some left over material that might form planets."
Jun
6
comment What is the probability that a star of a given spectral type will have planets?
"...since these are often dead F, G, and K stars." Do you have a reference for that? I have never heard that before. F and G stars end up being white dwarfs, do they not? And late K stars are red dwarfs.
Jun
6
accepted How many stars are in the Milky Way galaxy, and how can we determine this?
Jun
5
asked Why are there more lunar maria on the near side than on the far side?
Jun
5
asked How many stars are in the Milky Way galaxy, and how can we determine this?
Jun
4
comment When will the Moon reach escape velocity?
@Mr. Disappointment: Reach equilibrium in what sense? If the moon's acceleration is to cease (per the standard theory), then the earth's rotation rate will also stop slowing down. That will happen when both bodies become locked to each other, showing the same side at all times. The Pluto-Charon binary system is a good example of this. If that's what you meant, then yes they will reach equilibrium.
Jun
3
comment How are Cepheids used to evaluate their distance?
This reference (pages 11 and 12) that I found states that Zhevakin's discovery was published in 1953 (in Russian).
Jun
3
answered What criteria were used to set the “useme” flag in the NOMAD astrometric catalog?
Jun
2
answered When will the Moon reach escape velocity?
Jun
2
answered Why can we see the cosmic microwave background (CMB)?