Activity for James McLellanâ€
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #288134 | Initial revision | — | 11 months ago |
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What are the Names of the Earth-Sun L4 and L5 Regions? The Earth-Moon Lagrange points have names: L1, L2, and L3 are Libration Points, the L4 and L5 points are the Kordylewski Clouds. The Jupiter-Sun L4 is named the Greeks, and the Jupiter-Sun L5 is named the Trojans. What are the names of the Earth-Sun L4 and L5? (more) |
— | 11 months ago |
| Edit | Post #288133 | Initial revision | — | 11 months ago |
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Does 5th Gas Giant Have a Name? I recently learned that it's believed that the solar system once had one more gas giant, which was ejected by Jupiter some time in the past. https://thesolarsystem.fandom.com/wiki/FifthGiant Does anyone know if this hypothetical planet has a name? (more) |
— | 11 months ago |
| Edit | Post #287511 |
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— | over 1 year ago |
| Edit | Post #287511 | Initial revision | — | over 1 year ago |
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What are Some House Games for Free Fall? Living in space can be boring. What are some good home games for people living and working in free fall? I thought of a few - - Bocce : in this variant the size of the jack and the player balls is swapped. The jack is large, massive, and magnetic. Play begins by letting the jack free float in s... (more) |
— | over 1 year ago |
| Edit | Post #287510 |
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| Edit | Post #287510 | Initial revision | — | over 1 year ago |
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A: How can a Type II civilization influence accretion rates from a debris disk to a passing star? Kepler's Laws give us the velocity of everything in the debris field and comet cloud-- At any radius, $i$, the velocity of the circular orbits (and a good rough definition of a "belt", although this is excluding highly elliptical objects) -- $ v{b,i} = \sqrt{{{GM{b}} \over {R{b,i}}}} $ Where $v... (more) |
— | over 1 year ago |
| Edit | Post #287495 |
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— | over 1 year ago |
| Comment | Post #287495 |
Both. But this question is for low gravity. I'll fix the text. Thank you! (more) |
— | over 1 year ago |
| Edit | Post #287497 | Initial revision | — | over 1 year ago |
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Considerations for Recreational Solar Sailing? I was investigating a few ideas on recreational solar sailing, and came up with some interesting things - The primary equation in solar sailing is $ F = {{2 R S A} \over {c}} \sin^2{\theta} $ Where - R is the fraction of incident light - S is the solar flux being received (Watts per meter ... (more) |
— | over 1 year ago |
| Comment | Post #287486 |
You may be right. I thought the OP was asking about cutting out the conversion to steam and driving a turbine.
As just a plasma current, at some point you'd want to transform / rectify / clean the power... wouldn't you? (more) |
— | over 1 year ago |
| Edit | Post #287495 | Initial revision | — | over 1 year ago |
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How Could Golf Change in a Low-Gravity Environment? Low gravity golf was invented by Alan Shepard in 1971 when he hit two golf balls 40 yards on the moon. Surprisingly, this version of the sport with little atmosphere and much lower gravity, is the most common that will be played on the planets in the solar system that are already top candidates fo... (more) |
— | over 1 year ago |
| Edit | Post #287486 |
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| Edit | Post #287486 | Initial revision | — | over 1 year ago |
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A: Electricity from nuclear decay According to this site, the kinetic energy of the two alpha particles emitted is 4.273 MeV. As you said, these aren't neutral atoms yet with balancing electrons. So, they are a charged plasma. Imagining, instead of a shielded lump, that you had your sample crushed fine on a dish, (so that the h... (more) |
— | over 1 year ago |
| Edit | Post #287485 | Initial revision | — | over 1 year ago |
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Is Scientific Speculation the Right Place for a Discussion Series About Space Sports? I feel like science fiction doesn't have many sports, other than the occasional laser battle or fantasy sword duel. I'd like to start a discussion series about sports in a low-gravity/no-gravity environment. Not necessarily a single question with a single answer. I started with a question about wr... (more) |
— | over 1 year ago |
| Edit | Post #287455 |
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| Edit | Post #287455 | Initial revision | — | over 1 year ago |
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A: How would an interstellar spaceship's speedometer work if everything else is moving? I'd recommend a Kalman filter to increase measurement accuracy to the overlap of multiple system errors so that you get the best result. For inputs, may I recommend - - a calculation of doppler shift for known stars. You can do this realtime. Take a fast fourier transform of the incoming light ... (more) |
— | over 1 year ago |
| Edit | Post #287368 |
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— | over 1 year ago |
| Edit | Post #287368 |
Post edited: added nonrealism |
— | over 1 year ago |
| Comment | Post #287395 |
I had thought about that. You might be able to hold the competition inside a room only a little bit larger than the occupants, and they leverage off an opposing wall to perform a pin. (more) |
— | over 1 year ago |
| Edit | Post #287394 | Initial revision | — | over 1 year ago |
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A: A hair product which is both a lipid ointment and a gel Yes. Although this may be streching your definition of oil a bit. The oil product could host some sort of microfauna that cure the product by building EPS microstructures. https://en.m.wikipedia.org/wiki/Extracellularpolymericsubstance (more) |
— | over 1 year ago |
| Edit | Post #287393 | Initial revision | — | over 1 year ago |
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How Would the Sport of Wrestling Change in a Microgravity Environment? How would competitive wrestling change in a microgravity environment? (more) |
— | over 1 year ago |
| Edit | Post #287368 |
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| Edit | Post #287368 |
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| Edit | Post #287368 |
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| Edit | Post #287368 | Initial revision | — | over 1 year ago |
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Meaning of Non-Locality? Theory ### If I am understanding this history of this correctly, in the 1920s the mathematical process of converting measurements with a certain amount of measurement error into numbers, then doing your calculation, wasn't doing a very good job of predicting the experimental outcomes of nuclear ch... (more) |
— | over 1 year ago |
| Comment | Post #287351 |
If you spin it, what services does it provide? Can you still get things to and from the surface cheaply? (more) |
— | over 1 year ago |
| Comment | Post #286604 |
@#8046 I have another question : I may have misunderstood your response that there are no accepted answers by design to mean we want to foster discussions, not be narrowly "one question, one answer". With that in mind, I started a discussion https://scientific-speculation.codidact.com/posts/287351 th... (more) |
— | over 1 year ago |
| Edit | Post #287351 |
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| Edit | Post #287351 | Initial revision | — | over 1 year ago |
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Discussion of Aerogel Orbital Rings Orbital rings are a proposed megastructure intended to dramatically reduce the cost to enter or exit a planetary gravity well. The ring is a solid structure, belting around the planet like a hula hoop. Because it is solid, any loss of gravitational potential energy (falling) on one side would be ... (more) |
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| Edit | Post #287348 |
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| Edit | Post #287348 | Initial revision | — | over 1 year ago |