celtschk‭

After an age of highly developed technology, including many different satellites in various Earth orbits, humanity loses the technology needed to control those satellites. After many centuries, how...

1 answer  ·  posted 4y ago by celtschk‭  ·  last activity 2y ago by deleted user

I've got this idea of a rogue planet that is moving that fast through the intergalactic void that the cosmic microwave radiation, thanks to the Doppler effect, actually provides enough heat that it...

1 answer  ·  posted 3y ago by celtschk‭  ·  last activity 3y ago by dsr‭

While the other posts did already explain the issues with the cube-formed Earth, I just want to give a feeling of the dimensions we are speaking of. Imagine that the centre of the cube's faces are...

posted 2y ago by celtschk‭  ·  edited 2y ago by celtschk‭

The first question is: What is instantaneous speed measured against (that is, what is the “ground” relative to which the speed is measured)? Remember that there is no such thing as absolute speed. ...

posted 3y ago by celtschk‭

Since manipulation of the brain is prohibited and illegal modifications are assumed to be reliably caught, the obvious way to check someone's identity with biometry would be by checking their brain...

posted 4y ago by celtschk‭

Gravity You seem to assume that the Moon's mass is mostly concentrated in its core. While I didn't find detailed data on the Moon's density distribution, this Wikipedia page tells that the density...

posted 3y ago by celtschk‭  ·  edited 3y ago by celtschk‭

Machines are not in a hurry, impatience is one of those inferior human traits the machines want to eliminate. Therefore it is not necessary to have humans give up their life; it's sufficient to jus...

posted 9y ago by celtschk‭  ·  edited 4y ago by celtschk‭

It would mean a more complicated modulation of the tides. On earth, we have a superposition of two cycles: An exactly 12 hour cycle of the sun, and a cycle deviating from that by the moon. The moon...

posted 10y ago by celtschk‭

Growing from a very small size to an extremely large size is no problem, as dinosaurs show (and remember, ultimately even the largest dinosaur started as a single cell; the size of the egg is basic...

posted 10y ago by celtschk‭  ·  edited 3y ago by celtschk‭

According to this answer to another question an Alcubierre drive would need to have a channel setup far in advance. So with such a technology, you'd need to have a network on established lanes just...

posted 10y ago by celtschk‭  ·  last activity 6y ago by celtschk‭

All the answers so far dealt with the ship creating gravity itself. But there's another possibility: The ship might have some sort of gravity shields (to allow to pass close nearby heavy objects li...

posted 10y ago by celtschk‭  ·  last activity 10y ago by celtschk‭

OK, so we have two sun-like stars (I'll just write "suns" from now on) at $100\,\rm AU$ distance, and a (probably earth-like) planet at $1\,\rm AU$ distance from one of the suns. I'll call the sun ...

posted 9y ago by celtschk‭  ·  last activity 9y ago by celtschk‭

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

Human language evolved for the interaction between humans. That may sound like a trivial fact, but it isn't: If there had not been social interaction between humans, humans would not have evolved l...

posted 9y ago by celtschk‭

Assume someone detonates a Hiroshima-sized nuclear bomb in space. Since in space there's no air, the bomb will behave differently than on Earth. In particular, there will not be an air pressure wav...

4 answers  ·  posted 9y ago by celtschk‭  ·  last activity 9y ago by celtschk‭