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Apr
17
comment How do I see DSO's in my telescope?
Does "DSO" mean "Deep Sky Object"? If so, it's probably best not to assume that everyone knows that (I didn't).
Apr
14
comment How can apparent magnitude be negative?
@barrycarter: I think the confusion is caused by the fact that the ratio between two successive magnitudes (100**(1/5), or about 2.512) happens to be quite close to 2.5. But the 2.5 in the formula is exact. It's 5 / log(100). There just happen to be two relevant numbers, one an exact fraction and one an irrational number.
Apr
3
comment Is it possible that Mercury was originally the moon of Venus after a giant impact?
Any large rocky body with no atmosphere is likely to look similar to the Moon and Mercury. Their appearance is dominated by impact craters. That tell you much about whether it's a (former) moon.
Mar
13
awarded  Enlightened
Mar
13
awarded  Nice Answer
Jan
21
comment Identify this object
Do you know enough about the characteristics of the telescope and camera to estimate the angular size of the object? Can you estimate more precisely when and where you took the photo, and where in the sky the scope was pointing at the time?
Jan
21
comment Is there a ninth planet?
They've found evidence of it, but they haven't confirmed it.
Jan
18
revised The relation of the lit side of the moon and the sun
added 67 characters in body
Jan
18
comment The relation of the lit side of the moon and the sun
I've edited the question, changing "blit" to "lit". nikolaos, if this isn't what you meant please edit the question again.
Jan
18
revised The relation of the lit side of the moon and the sun
Fix typos
Jan
17
comment How Are Radioactive Decay Rates Influenced by Neutrinos - On Earth and Other Dense Planets
Somebody should repeat the experiment in a controlled underground environment.
Jan
17
comment The relation of the lit side of the moon and the sun
@pela: I think I know what the OP is asking. See my answer.
Jan
17
answered The relation of the lit side of the moon and the sun
Jan
4
comment Why aren't new stars in Earth's relative proximity constantly discovered?
" ... the link I provided above ..." -- Please include that link in your answer.
Dec
21
comment Can a star have a ring system?
Most or all of the planetary ring systems we know about are within the planet's Roche limit. A star could have a ring of debris within its Roche limit, but it would probably be destroyed fairly quickly by light pressure and stellar wind. (The asteroid belt and the Kuiper belt as far outside the Sun's Roche limit.)
Dec
16
answered At what rate are stars accelerating?
Dec
16
comment At what rate are stars accelerating?
The question was about the rate of expansion. You haven't addressed that.
Nov
27
comment Plausible? Brown Dwarfs are rogue celestial bodies because they absorb all light due to their thick layer of matte black soot
@TheVoid: I don't see how their color relates to their trajectory. As we've said, light pressure would have no significant effect on the motion of a brown dwarf.
Nov
27
comment Plausible? Brown Dwarfs are rogue celestial bodies because they absorb all light due to their thick layer of matte black soot
@userLTK: Thank you for the corrections. I've updated my answer accordingly.
Nov
27
revised Plausible? Brown Dwarfs are rogue celestial bodies because they absorb all light due to their thick layer of matte black soot
Clarify: Mass not size, some fusion