Keith Thompson
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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