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It's totally possible (sort of)! Such stars are called - not surprisingly - intergalactic stars. These stars are often referred to as hypervelocity stars, because in order to reach galactic escape...
Once the humans figure out that the zombie fungus will help make the planet more hospitable, they'd want to get the process started as quickly as possible. They might not want to start the process...
Path 3 if it's possible. Since the Remnanter's are basically data, and since sharing data is what computers do, the only really tricky part for syncing them up is figuring out what format to put th...
Hands are now useless. We use our hands to carry lots of things. This generally involves curling our fingers around something, which in turn blocks the palms of our hands. If we had eyes on our p...
Other answers and comments mention axial tilt, and I agree that should be part of your thought process. You might also add something akin to the El Nino - La Nina cycles. On an irregular but roug...
I don't really think so... The largest a gas giant can get without being a star itself is a L class brown dwarf, which is just under the size needed for fusion to start. The least massive star kn...
So to figure out size, you have to determine all the stuff that needs to go in it. First, population. On the low end, the minimum viable population could be around 180 people, and with the right...
It depends. Heavy water proves toxic to human cells at levels ~20% of a human's body weight (although other sources give 25%). At lower levels, however, it's harmless. Given that ~2/3 of a human's...
20000 people is a huge population on a generation ship. With careful breeding 200 people have enough genetic diversity to support 80 generations (~2000 years) without running into problems. With...
One disadvantage is that it would tie monetary gain to hive mind thinking. Say you live in an area where the majority of people see women as second class citizens. If you get up and say "You kno...
The major problem here is that, while we don't know for sure what this planet is like - after all, the paper (Batygin & Brown (2015)) was based on simulations of the movements of Kuiper Belt Ob...
He can already move at 400 mph on the ground. At those speeds you don't want to do anything that requires maneuvering, like dodging a tree. There is a reason they use the salt flats for things like...
The effect of Mars on Earth is negligible. The total force between the planets is — at their closest approach — $$F_{\text{max}}=\frac{GM_{\text{Earth}}M_{\text{Mars}}}{r_{\text{min}}^2}\approx8.6...
Because the android can be whatever you want it to be, I think the personality will be modular, and that people will be able to buy personality types that they want or that will fit their mood that...
It's quite possible, and some animals already have them. Some arachnids have what are known as book lungs - small respiratory cavities that actually are not lungs, but different respiratory organs...
Rat poisons are a good start Thallium is one, and was widely used. Depending on dosage Thallium can be either fast or slow acting, potentially taking several weeks from the initial poisoning. There...
I think you are pushing the boundary of believability a little too far, at least for someone who is somewhat familiar with orbital mechanics. (That may or may not be a problem for your intended aud...
A fusion drive would fit your requirements, and produce plenty of thrust. One of the early designs estimated that the VISTA spacecraft could deliver a 100-tonne payload to Mars orbit and return to...
A few days, at best If you want to detect a supernova as quickly as possible, you need a neutrino detector. Supernovae produce substantial amounts of neutrinos - which actually carry away much of ...
Turns out this is happening- right now, on this planet, in reality. All you need is some smog. This photo from Beijing last year looks rather bronze-ish to orange-ish I think. (image source: In...
Dust/fines in the atmosphere would be able to do it. Mars has a reddish sky because of this. The reason is that the dust particles in the atmosphere absorb sunlight in the 0.4-0.6 µm range, giving...
Pigeon Express Messenger birds have been around for a long time, and can travel much faster than a man on horse. The Romans were good at roads, and with peace comes trading, so it would be in ever...
Colonization of other moons and planets You could open up portals around a bunch of bodies in our solar system to increase insolation and make teraforming more viable. Titan would be a real po...
The most durable information storage is having it carved in stone or in clay that then got burned. Our oldest writings are of that form, and they are thousands of years old. The main problem of thi...
Food would be an obvious one, where plants would need to be able to grow in low light levels. Precipitation means clouds, which means lower solar energy reaching the ground. This isn't really a pro...
