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rob
  • Member for 10 years, 7 months
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Is Pluto still a dwarf planet?
Note that Dawkins used the phrase earlier in "The Ancestor's Tale," in a much less political context.
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Is Pluto still a dwarf planet?
replace dead link with archived version
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Are toroidal black holes hypothetically possible?
Change broken PDF link to abstract link
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If the Sun was replaced with a sun-mass black hole, would it be visually detectable?
@Jasen It can't. For black holes which are colder than their surroundings, including the CMB, the competition between Hawking radiation and radiation absorption moves energy into the black hole, making it colder. Hawking radiation doesn't become a mass-loss mechanism until the CMB is redshifted to be colder than the black hole.
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What if Earth’s moon started rotating?
Link-only answer: it would just lock again. See this Physics post, which is mostly about the tidal locking of the primary.
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What if Earth’s moon started rotating?
Minor comment: the tidally-locked Moon rotates once per orbit.
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Discrepancy between my results of Great Conjunction 2020 and Wikipedia
The wikipedia article gives a table of numbers without any source, which is poor form for them. Your difference of ten-ish minutes makes me wonder if either calculation takes into account the observer’s latitude and longitude, or imagines an observer at Earth’s center.
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Why does Titan have lower surface gravity than the Moon when Titan is more massive?
@Tosic Oh! That wasn't what I meant (note that Earth is larger than and denser than either the Moon or Titan). I've added a sentence which hopefully clarifies.
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