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StupendousMan
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StupendousMan
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2006-Sep-25
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2013-Jun-16
01:59 PM
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2013-Jun-14,
05:05 PM
StupendousMan
replied to a thread
[Astronomical] Definitions
in
Astronomy
http://www.amazon.com/Allens-Astrophysical-Quantities-Arthur-Cox/dp/0387987460/ref=sr_1_1?ie=UTF8&qid=1371229485&sr=8-1&keywords=Allen+Astrophysical+Q...
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3 replies | 173 view(s)
2013-Jun-14,
05:02 PM
StupendousMan
replied to a thread
Why must galaxies form through mergers?
in
Space/Astronomy Questions and Answers
The Milky Way (and other spiral galaxies) has a halo of very old stars in a roughly spherical distribution. It also has gas in a disk. Can you...
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25 replies | 466 view(s)
2013-Jun-13,
12:04 PM
StupendousMan
replied to a thread
Why must galaxies form through mergers?
in
Space/Astronomy Questions and Answers
Have you considered the possibility that the merging occurred before most of the gas in each system had been converted into stars?
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25 replies | 466 view(s)
2013-Jun-13,
12:00 PM
StupendousMan
replied to a thread
Force of charge
in
Space/Astronomy Questions and Answers
If you are trying to find the mass of electrons and protons such that the electrostatic force between them at 1 AU has the same size as the...
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14 replies | 223 view(s)
2013-Jun-07,
05:49 PM
StupendousMan
replied to a thread
How long would it take for a manned craft to reach Jupiter's moons?
in
Space/Astronomy Questions and Answers
Scenario A: ship goes from Earth to Jupiter via an elliptical orbit. It doesn't stop at Jupiter, just flies past it and continue back to Earth. ...
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21 replies | 358 view(s)
2013-Jun-07,
12:07 PM
StupendousMan
replied to a thread
How long would it take for a manned craft to reach Jupiter's moons?
in
Space/Astronomy Questions and Answers
A manned mission to Jupiter would probably be planned as a round-trip -- right? In that case, the ship would need to carry enough fuel to go both...
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21 replies | 358 view(s)
2013-Jun-07,
02:03 AM
StupendousMan
replied to a thread
How long would it take for a manned craft to reach Jupiter's moons?
in
Space/Astronomy Questions and Answers
It's likely that a manned mission to Jupiter would use a particular trajectory called a "Hohmann orbit". I'll leave it to you to look up the...
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21 replies | 358 view(s)
2013-May-31,
10:48 PM
StupendousMan
replied to a thread
Angular Momentum and Axis Stabilisation
in
Space/Astronomy Questions and Answers
The angular momentum of a body depends on its mass M, its radius R, and the rate at which it is spinning. One can describe spin rate in several...
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27 replies | 400 view(s)
2013-May-29,
03:03 PM
StupendousMan
replied to a thread
Densest exoplanet found to date (and how dense can a planet really get?)
in
Space/Astronomy Questions and Answers
As I mentioned in my post above, the issue here is not with the radius of the planet -- that has been measured properly. The issue is that a very...
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8 replies | 256 view(s)
2013-May-29,
12:24 PM
StupendousMan
replied to a thread
CMB Update Plank - One side of the Universe is different than the other
in
Astronomy
It might be The Pesky Power Asymmetry
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5 replies | 174 view(s)
2013-May-29,
12:21 PM
StupendousMan
replied to a thread
Densest exoplanet found to date (and how dense can a planet really get?)
in
Space/Astronomy Questions and Answers
You ought to read the original paper from which the mass estimate comes: Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple...
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8 replies | 256 view(s)
2013-May-28,
12:52 PM
StupendousMan
replied to a thread
Yellow snow rejected
in
Astronomy
If one is speaking about astronomical photometry, rather than human vision, then in these modern times, photometry is indeed sometimes best...
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27 replies | 765 view(s)
2013-May-25,
03:13 PM
StupendousMan
replied to a thread
Best current extinction maps
in
Space/Astronomy Questions and Answers
weltevredenkaroo, I hope you'll post your work here (or at least provide pointers to it) so that we can all read it. Please use this thread if you...
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6 replies | 189 view(s)
2013-May-23,
11:07 PM
StupendousMan
replied to a thread
Questions About Our Sun.
in
Space/Astronomy Questions and Answers
When discussing the orbits of very small particles around a star, one must take into account not only gravity and radiation pressure but also the...
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27 replies | 863 view(s)
2013-May-22,
10:42 PM
StupendousMan
replied to a thread
Will the gravity of Kepler-62e (1.6 x Earth) be stronger than Earth's?
in
Space/Astronomy Questions and Answers
I ran across a paper which provides detailed models of the mass and radius possibilities for rocky planets: ...
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19 replies | 444 view(s)
2013-May-20,
07:59 PM
StupendousMan
replied to a thread
Dark energy question.
in
Space/Astronomy Questions and Answers
Is gravity a force or not? If you are talking to people who are not graduate-level physicists, the most helpful answer is "yes". If you are talking...
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53 replies | 1346 view(s)
2013-May-19,
12:54 AM
StupendousMan
replied to a thread
Converting B - V or V - I extinctions to visual magnitude at eyepiece
in
Space/Astronomy Questions and Answers
You can get a rough guess by equating the extinction perceived by human eyes to extinction in the V passband. In that case, the standard conversion...
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1 replies | 91 view(s)
2013-May-19,
12:49 AM
StupendousMan
replied to a thread
Best current extinction maps
in
Space/Astronomy Questions and Answers
Schlegel et al.'s maps are still the best general maps of extinction within the Milky Way, at least for the general case of a line of sight in some...
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6 replies | 189 view(s)
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