lvella
  • Member for 4 years, 6 months
  • Last seen more than a month ago
Need reasons why a satellite network would not work
11 votes

I once stood at the middle of Uyuni salt flat, which is a 10,000 km2 flat surface 3 km above sea level. It was daytime and I had just replaced the batteries for my Garmin hand GPS (this was in 2011). ...

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Allowing voting against politicians as well as for them
7 votes

There are so many different and well studied voting systems, each one with its particularities. For instance, this site presents a single election evaluated with 4 different methods which gives 4 ...

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What would be the most efficient and cost effective way to stop a star's nuclear fusion ('kill it')?
3 votes

The way it was done in one of the Revelation Space books is: Sure the whole process goes largely unexplained and relies on fictional physics, but at least the scales involved are more scientifically ...

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In a world without fossil fuels, would air travel ever really be developed?
3 votes

In Brazil "pure" ethanol (94% ethanol, 6% water) is sold at every gas station, and pretty much every new car sold can run with any proportion gasoline-ethanol mixture (they call it "...

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Would earthlike planets in other solar systems have well-known Earth gemstones such as rubies, emeralds and sapphires?
3 votes

Depends on what you mean by "earthlike". If you mean as the conditions to sustain life -- i.e. a rocky planet orbiting a star's habitable zone, with a moon and not tidal locked to the star (thus, ...

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How much volume does a liquefied human take?
2 votes

It really depends on the pressure, because liquids are, contrary to common belief, compressible, it just takes much more pressure than gases. In fact, everything is compressible, even the most ...

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How to prevent humanity from using alien spaceships and technology exclusively?
2 votes

Unless humans are physiologically incapable of understanding alien technology (i.e. too small brains), the problem of alien incomprehensibleness is solved in about 15 years, as the new generation of ...

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Will people suffer from the same diseases on other planets?
2 votes

Mark's answer is great because it classifies the many causes of diseases. Let me make a note on a group of diseases I'll call "parasitic diseases", extending Mark's classification of bacterial and ...

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Replacing the core of a planet with a sun, could that be theoretically possible?
1 votes

If it is possible, there are so many equilibrium points that must be balanced that I doubt such thing would exist for too long. These are the points I can think: To prevent the rock crust surrounding ...

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How is warfare affected when armor has (temporarily) outpaced guns? How can guns compete?
1 votes

This is just a small partial answer, but in medieval times, a full plate was pretty much impenetrable. The thing is: only knights and nobleman could afford full plates, so most of the people in the ...

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Possible Long Term Effects of Frequent Teleportation
1 votes

If each teleportation produces about the same amount of molecular disruption of a single CT scan session (which is undetectable by itself, but we can estimate in the CT scan case by measuring the ...

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Earth was suddenly teleported away from the sun. Can we recover?
0 votes

I agree with Michael Borgwardt's answer: there is a very small chance a few small clusters of humans will survive in places with high geothermal activity, specially if there are already geothermal ...

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Law enforcement in FTL civilization
0 votes

Considering there are more than 100 nations on Earth, I don't see any reason to assume any jurisdiction will span much more than they do today. Maybe at planet level in smaller colonies, considering ...

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How to explain a world with very little iron?
0 votes

I remember a hard sci-fi book where colonists in a spaceship end up having to choose in which period of the universe history they were going to choose a planet to colonize. They ended up in a much ...

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Would it be possible to use geothermal energy on mars?
-1 votes

One more detail, Earth's crust is much more active than Mars' because we have a (huge) Moon. The thermal energy that keeps the core liquid and generating Earth's magnetosphere comes from Earth's spin ...

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