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So you have to look at the different ways that energy is created. Most of the power plants we have boil down to something turning a turbine, which creates electricity. Coal, nuclear, etc all work b...
Atmospheric pressure 0.20% of that on Earth's surface? Take a look at the phase diagram for water: 0.20% of 1 atmosphere pressure means about 2 millibar. At that pressure, liquid water cannot e...
It's worth noting that even fairly dark objects will reflect some light. Unless the space elevator is completely absorbent (which is possible, as Vantablack is made of carbon nanotubes, but unlikel...
So the good news is that if you have the capability to construct a Dyson sphere, you have the capability of supplying it with resources. The sheer amount of matter needed is huge, and you'd need t...
Never. The problem is not being able to simulate a human brain; that one I consider possible, and probably even achievable on affordable hardware at some time in the future. The problem is taking ...
In a young planet, oxygen can be produced from water vapor via photodissociation, which occurs along a pathway like $$\text{H}_2\text{O}+h\nu\to\text{H}+\text{OH}$$ $$\text{H}+\text{OH}+h\nu\to2\te...
Sefa's answer is correct. Due to Newton's shell theorem, the force on any object inside (and due to) a spherically symmetric object of uniform mass density of exactly zero. The exact integration (s...
If it has a mane like a lion, this could be your heat shield. If it flaired out like a large umbrella and was made of a thin membrane or possibly fur, then it would block its body heat from whateve...
What a hurricane boils down to is a large difference in air pressure between two parts of the earth. Air from the high-pressure region attempts to move toward the low pressure region. Along the w...
Let's determine some basic parameters of the cluster. You say you want the stars to be 1-2 light-years apart. This is a little tricky because star clusters don't necessarily have uniform densities...
This has been proposed, believe it or not. Gravity is the weakest of the four fundamental forces, a mystery which has been dubbed the hierarchy problem. Several solutions have been floating around;...
No, it will not, no matter the changes done while keeping it a F-22 Wikipedia gives the data for the F-22 as empty weight 19,700 kg and a maximum take-off weight (MTOW) of 38,000 kg. That gives a ...
This is just a basic answer, but I used Samuel et al. (2014), who in turn cited the climate model of Léger et al. (2011) for a tidally-locked planet with no atmosphere. They give the formula for s...
This diagram from ck12.org shows where water ends up on Earth. Yes, this is dramatically simplified, but look at the side away from the moon. The implication here is that you will not only get an...
I don't think so, considering the distances involved, and the kind of density you'd need, unless a lot of it is "below the surface" embedded in the dark matter or in subspace. Maybe if the whole...
It could be possible for them to have a duel system (both gills and lungs), like lungfish. Some lungfish are able to run the two systems independently, so when they are breathing through their lu...
Let's think about why a supernova happens in a massive star. You probably know that after a star develops an iron core, further nuclear fusion is not possible on a large scale. Yes, you can produce...
Direct gravitation energy is a lost cause in freefall. If you're close enough to get gravity, then you're no longer in orbit and will die soon. There is a work around though, which does use gravit...
Maybe it doesn't actually have much to do with light as it does with nutrients. Say the mushrooms are parasitic on other plants and aggressively predatory. Their spores invade a forest, latch onto ...
To properly determine the orbital path of the asteroid, you'd need to do a numerical simulation (the three-body problem here likely not having an analytical solution). There are certainly $n$-body ...
Convert mass density to energy density, to get $9 \times 10^{-11}\,\mathrm{J/m^3}$ which isn't very much. After all, an adult human is on order of one eighth to one quarter of a cubic meter. So, a...
I like Sepratrixes answer as it interprets the old style question framework by OP. As a start the first thing would have been to research what the Mars colonist teams have planned and then make al...
We can use something called Kleiber's law (which I originally found here). It states that a power law describes the relationship between metabolic rate $q$ and mass of an animal $M$ (in kilograms):...
As Gary Walker said, there are not that many places that have land on a straight line tunnel that goes straight through the core. The good news is that you could go around the core by taking a hy...
How would the civilization discover electricity? That one is easy: There are animals in the sea that use electricity, like the electric eel. The underwater civilization would certainly be curious ...
