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Can I use a trebuchet to launch satellites into space from a lunar colony?
82 votes

No. No matter how much velocity you can give your satellite, its trajectory will either contain the point it was launched from or not be a closed curve. an object is in orbit if it returns to its ...

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In the shadow of a planet (science fiction)
Accepted answer
16 votes

Have the planet orbit very close to a Pulsar or some other exotic star. A neutron star is very small (few Km in diameter), for this reason your planet would have a very large shadow, thus making the ...

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Lembas bread (2000 Calories per bite)
8 votes

Complete foods are already a thing! Ever heard of soylent? They contain not only the calories, but all the nutrients you need in your RDI. Some even look like biscuits and energy bars, like the ...

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Reasons for time dilation to happen on a habitable planet with same g force and not orbiting a black hole
6 votes

ArtificialSoul gave a great answer. But there might be another way. The planet could rotate really fast, like REALLY REALLY fast. Obviously centripetal forces would tear it apart unless... the planet ...

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Redesigning the human body to flourish on a high-gravity world?
Accepted answer
6 votes

Make them shorter. There are a number of option to consider, however making your people shorter is probably the easiest thing you can do. If you cut people's average weight by just 10 Kg that turns ...

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Is it possible to build long-lived macro-scale structures out of non-atomic substances?
4 votes

Alright! So You want not-periodic table matter.. Let's see. As some have said the problems with these things is that they do not clump together and they last uhm... nothing. We can make them last ...

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Gravity on an Orbital Ring
3 votes

From the question and some of the answers I read there seems to bit of a misunderstanding of the subject at hand. I will try to clarify. An Orbital Ring (OR from now on) is NOT some kind of giant ...

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Methods for simulating low gravity on high-g planets
3 votes

1) Antigravity! Just handwave the problem away! 2) Live deep underground where the gravity drops to 1g, you will need a way to counter the extreme pressure 3) Live in a gravity train; you can build ...

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Would a planet with a 4 year solar orbit have differing seasons?
3 votes

yes you can have something like that. they are called superseasons We have them on Pluto. Also here. It's basically what you describe; you have seasons within seasons, like a "cold winter" and a "...

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Is an artificial gravity room on a modern spacecraft or space station feasible?
2 votes

It doesn't really make much sense to have only a room. If you can build it it would be better for it to represent all (or almost all) of the living space available. If the room available is limited ...

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Is petrifying vision plausible in an animal?
1 votes

Fossils Fossils are petrified bones/tissues, sometimes even complete creatures. Your Gorgon shoots Tachions out of its eyes that concentrate the timespan of a few million years in an instant, causing ...

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Does anyone know of a poison that can be ingested and is undetectable in autopsy?
1 votes

Use Ricin, or, even better, a similar protein. Ricin is a toxic protein produced by Ricinus communis. It is toxic if ingested and therefore does not leave any injection mark. It has the effect of ...

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How long does a component of a Dyson swarm spend in shadow?
1 votes

As AndyD273 stated, there are many factors to consider. Having elements shield each others is very inefficient, that's why most Dyson swarms feature statites, they do not cast shadows onto each ...

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Can We Build Erebor
1 votes

We can most certainly build such a structure. We build all kind of structures underground and within mountains. check out these idiots! And take the virtual tour of their temple. We build tunnels ...

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What animals would be quickest to adapt to a low gravity world?
Accepted answer
1 votes

I would say almost any animal. smaller animals are "less susceptible" to gravity changes since being smaller they have a lower volume/surface ratio, so with a 0.72 g they would barely notice. water ...

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Why would a spaceship rely on hydroponics instead of algae for food?
0 votes

Tim B II excellent answer covers many good points, I'd like to add a couple more that I think are key. Growth Have you ever actually tried growing algae? It's not easy trust me, they grow in liquid ...

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How would life evolve, or could life be engineered to live, in the absence of an atmosphere?
0 votes

We can try engineer insects to live in a vacuum. I start with insect, because they have exoskeleton which is already a good start for a spacesuit, plus some of them are excellent jumpers, which could ...

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