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13.1k posts
 
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Q&A High-Energy Exhaust Shielding for Far-Future Drive

You have mass flow rate and velocity, but the area this is spread over will say a lot - $$\dot{m} v = F = 1 {{kg} \over {s}} \cdot 1,000 {{km} \over {s}} \cdot 1,000 {{m}\over{km}}= 1 \times 10^{6...

posted 2y ago by James McLellan‭

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Q&A How to reduce tornados in the US Great Plains?

Tornados and the thunderstorms that often spawn them are driven by rising columns of air. Such "thermals" are stronger and more likely in open terrain, like is prevalent in Tornado Alley. Let the...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A How would an interstellar spaceship's speedometer work if everything else is moving?

Whatever means you use, it would make sense to have two measurements: Time To Destination (TTD) relative to yourself, and TTD relative to the destination. E.g one year for you, two years for the pe...

posted 2y ago by Strider‭

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Q&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 s...

posted 2y ago by James McLellan‭  ·  edited 2y ago by James McLellan‭

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Q&A Could there be a way for a solar system to be very precise, so that the lunar calendar and solar calendar align?

I think it's unlikely. Colloquially a year is 365 days. But if you actually watch Earth complete an orbit in space, it will not be at the same rotation around its axis at the end as when it starte...

posted 1y ago by matthewsnyder‭  ·  edited 1y ago by matthewsnyder‭

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Q&A Analogue Encryption, without converting to digital

No, the scheme described doesn't make sense, regardless if it is digital or analog. Anybody can intercept the public key and decrypt so the scheme doesn't protect against eavesdroppers. The entiti...

posted 1y ago by Maarten Bodewes‭  ·  edited 1y ago by Maarten Bodewes‭

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Meta Incorrect number of answers showing in questions list

I've noticed that some questions have a mismatch between the number of answers showing in the question list page, and the number of answers showing on the specific question page. For example, the R...

1 answer  ·  posted 2y ago by trichoplax‭  ·  last activity 2y ago by Monica Cellio‭

Question bug
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Q&A How Could Golf Change in a Low-Gravity Environment?

Golf morphs into a multiple players action sport Nothing could be more boring than watching one person hit a small ball, then trudging after it while wearing trés chic golf pants and visored caps....

posted 3mo ago by Antares‭  ·  edited 3mo ago by Antares‭

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Q&A What would make a star good for star lifting?

Previous Concepts I did a quick literature review for this on google scholar, and unfortunately it seems like there isn't much research on the topic. I did however find this short article, which h...

posted 4y ago by el duderino‭

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Q&A How efficient can a Dyson sphere be?

I think a reasonable assumption is that you don't want to accumulate entropy from the Dyson sphere. That is, the entropy you get from the star must not be lower than the entropy you send to outer s...

posted 4y ago by celtschk‭  ·  edited 4y ago by celtschk‭

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Q&A Do seasons occur on a tidally-locked planet?

Both the other answers (at this time) suggests making the orbit eccentric. The variable distance from the sun makes the planet hot or cold. This is correct. But there is one important aspect of ...

posted 4y ago by Stig Hemmer‭

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Q&A What organs or modification needed to have tree that gain energy from lightning or electricity?

As L.Dutch said, lightning is super energetic and any plant probably wouldn't survive it's strike. What I can imagine is the forest benefiting from some of its trees taking the hit for the team and...

posted 4y ago by Kechl‭

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Q&A Do seasons occur on a tidally-locked planet?

Depends on the orbit I'm drawing on my answer to a different question here. Let's start with an overview of why there are seasons. I really like this description: We have seasons because the e...

posted 4y ago by Andrew Brēza‭

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Q&A Can velocity drift be used to calculate a radio wave source's distance from Earth?

Yes, it can. We can determine the distance to the source if we have an idea of what's causing that shift in velocity. Let's say that we have a source moving at a speed $v$ away from us. If it emit...

posted 4y ago by HDE 226868‭  ·  edited 4y ago by HDE 226868‭

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Q&A How large would be the habitable area in a tidally locked planet?

It would depend on the eccentricity of the orbit and the size of the orbit. So there are a number of orbital possibilities to consider. The problem even more complex because of a number of other va...

posted 4y ago by Slarty‭

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Q&A biologically or anatomically is there a problem with this type of double mouth or jaws?

Not gonna lie here, that looks way more like an disadvantage than an advantage. The main problem here is that this seems like an unnecessary redundancy. Yes, morays have 2 sets of Jaws, but the se...

posted 4y ago by ProjectApex‭

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Q&A Are these traits for my planet mathematically accurate? Could it support life?

Your star is not going to work, so the planet won't either. Mass of star: 1.04 M☉ Radius of star: 0.69 R☉ Surface temperature of star: 4,620° K Luminosity of star: 0.2 L☉ ...

posted 4y ago by StephenG‭

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Q&A How could the display technology of self-rewriting books work?

Leaving aside the durability issue, you should probably be looking at electronic paper. They work by moving colored particles back and forth to create the image. The term you're looking for is call...

posted 4y ago by ltmauve‭

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Q&A An alternative way to rotate or in this case rolltate

No. The way we define latitude and longitude is based on the planet's axis of rotation. You can certainly (AFAIK) have a planet with a 90° axial inclination, or (probably) a planet that is identica...

posted 4y ago by Matthew‭  ·  edited 4y ago by Matthew‭

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Q&A Inverse orbital direction

For an in-situ born planet, it can happen, though it is hard to have the exact chain of events. Basically you need to have a series of gravitational slingshots with a larger body that put your pla...

posted 5y ago by L.Dutch - Reinstate Monica‭

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Q&A Constructing a doomsday machine by manipulating the Higgs Field?

I think that this topic is one that's likely to generate a lot of misconceptions when people answer it, since it's a complicated topic and analogies/explanations that are given by pop science are o...

posted 5y ago by el duderino‭

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Q&A Feasibility of a black-and-white FTL drive?

Let me see if I got this right. You want to conjure an object, have it contain enough mass and gravity to collapse on itself without dissipating, motivate it to move at FTL speed, drag your vesse...

posted 5y ago by Dale Gusta‭

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Q&A If an ET has caramel blood, what it implies?

Interpretation: ET's blood equivalent is primarily composed of caramel, with some additional components, but without hemoglobin. The flesh tastes terrible, without rendering the caramel blood ined...

posted 4y ago by rytan451‭  ·  last activity 4y ago by rytan451‭

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Q&A Adjusting to the Sound of a Waterfall

I'd imagine that they'd build double skinned shield walls to deflect the noise from waterfalls. The most expensive parts of the city would also be the quietest, while the slums would be where the s...

posted 4y ago by Phoenix Stoneham‭

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Q&A Could power be generated using the temperature difference in venus's atmosphere?

100% YES It s called an updraft tower. You can actually even do that on earth in the Deserts (solar updraft towers). https://en.wikipedia.org/wiki/Solar_updraft_tower On Venus you wouldn't even...

posted 4y ago by Fred‭

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