Grey
Order of Kilopi

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2019-Dec-05, 04:17 PM

Grey replied to a thread Antigravity. in Space/Astronomy Questions and Answers

There are certainly a fair number of people who have tried to avoid the need for dark matter by instead introducing a modification to the way gravity...

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19 replies | 432 view(s)
2019-Dec-05, 03:20 PM

Grey replied to a thread What's the science behind moon landing live broadcast? in Conspiracy Theories

Actually, cable television and videotape were not invented until the 1950's. Live broadcast television predates that by a couple decades, with the...

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5 replies | 152 view(s)
2019-Dec-05, 02:55 PM

Grey replied to a thread Antigravity. in Space/Astronomy Questions and Answers

Well, as I mentioned over here, various nearby superclusters that are components of Laniakea appear to be bound, even though Laniakea itself does not...

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19 replies | 432 view(s)
2019-Dec-04, 02:58 PM

Grey replied to a thread Largest cosmological structure in Space/Astronomy Questions and Answers

The Laniakea Supercluster is the size you're looking for, but I believe that current thought is that it appears to not be gravitationally bound. I...

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14 replies | 309 view(s)
2019-Dec-03, 09:25 PM

Grey replied to a thread matter traveling at half the speed of light in Space/Astronomy Questions and Answers

Nice!

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6 replies | 152 view(s)
2019-Dec-03, 04:25 PM

Grey replied to a thread matter traveling at half the speed of light in Space/Astronomy Questions and Answers

The GZK limit is more or less the maximum energy a proton could keep after travelling a long distance through intergalactic space. Note that it...

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6 replies | 152 view(s)
2019-Nov-26, 12:59 AM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

I think that when you say "in the absence of such perturbation" you're missing the whole point of the orbit being highly non-Keplerian. Unlike the...

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33 replies | 1671 view(s)
2019-Nov-22, 05:06 PM

Grey replied to a thread Can a microscopic black hole absorb exactly 1 quark? in Space/Astronomy Questions and Answers

Generally speaking, any method of trying to remove a single quark from a multi-quark particle requires an input of energy. As more energy is put...

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4 replies | 170 view(s)
2019-Nov-22, 04:27 PM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

I think that the Sun's motion through the galaxy appears to be pretty close to circular, with an eccentricity well below 0.1, so that would mean a...

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33 replies | 1671 view(s)
2019-Nov-21, 07:51 PM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

Ah, my apologies for misunderstanding what you were asking. I see that grant gave you the answer you were looking for, though.

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33 replies | 1671 view(s)
2019-Nov-21, 03:36 PM

grapes replied to a thread Why do scientists use words they don't need to use? in Science and Technology

I think "Abelian" is just easier for some people to say than "commutative".

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74 replies | 1811 view(s)
2019-Nov-21, 06:06 AM

grapes replied to a thread Machine code? in Science and Technology

In old machine code, there was a situation that didn't differentiate between the binary that represented code and the binary that represented...

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20 replies | 437 view(s)
2019-Nov-20, 05:42 PM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

The arms are trailing (here's a diagram). I believe that most spiral galaxies where we can tell the direction of rotation have trailing arms, but...

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33 replies | 1671 view(s)
2019-Nov-15, 07:39 PM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

Just from a quick search, here's what looks like a rough answer:

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33 replies | 1671 view(s)
2019-Nov-14, 07:52 PM

Grey replied to a thread Sidereal, anomalistic and draconic periods of Sun in Milky Way in Space/Astronomy Questions and Answers

Depends a little on how you count, but I think the consensus at this point is four.

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33 replies | 1671 view(s)

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Conserve energy. Commute with the Hamiltonian.

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