1,807 reputation
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bio website skepsi.me
location
age 22
visits member for 3 years, 4 months
seen Aug 27 at 21:09

Jun
12
comment What happen when two galaxies collide?
Galaxies aren't mostly gas and dust. Most of their mass is contained in dark matter. Furthermore, most of the luminous mass is contained in stars.
Jun
12
comment Shapes of galaxies
This answer isn't very accurate. First of all, population III stars did not turn into supermassive black holes- they were perhaps larger than the largest of current stars, but not by much. Also, the supermassive black hole model is simply one idea of galactic formation. Scientists are still trying to see if the black hole formed before or after the galaxy, or if they formed concurrently. Finally, the explanation on why galaxies have their shape is wrong. There are multiple explanations, but each follow either a top-down or bottom-up approach.
Jun
12
answered What frame(s) of reference are used to measure the rotation of the Sun around the galaxy ?
Jun
9
comment Binary stars' apparent magnitude
@Jonathan: No way. Stars are opaque to light- in fact, it takes an extremely long time (on the order of hundreds of thousands of years) for the light from the core of our own Sun to make its way out to the surface. It is only from the surface that they can propagate in the vacuum of space.
Jun
9
asked Calculations of apparent magnitude
Jun
9
accepted Why is the Ritchey–Chrétien telescope preferred in professional astronomy?
Jun
9
comment What's dark matter and who discovered it?
It'd also be good to note that Dark Matter is a proposed mechanism for a "scaffolding" through which galaxies form (or, at least, that's one form of the idea). It's good that you made apparent that Dark Matter hasn't been detected yet, it is simply our best explanation for certain observations that have been made.
Jun
8
answered Binary stars' apparent magnitude
Jun
8
accepted What are the various kinds of Cassegrain telescopes, and what benefits and drawbacks does each have?
Jun
8
answered What is the name of our Galaxy?
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.