37 questions with no upvoted or accepted answers
2k views

How soon can the first stars form?

Introduction In our universe, the cosmic microwave background was formed approximately 400,000 years after the Big Bang. It was hot, but within a few million years after the Big Bang, it would no ...
125 views

Could a round legless creature be able to move by bouncing?

Working on my Nintendo Kirby alternate universe where things are more biologically realistic. Many life forms are roundish legless creatures that can move by bouncing. How can this work and is it as ...
74 views

What needs to be changed about the plate tectonics of my world?

So, after trying to make a few different world maps and not really feeling satisfied with them, I decided to attempt making a world a bit more from scratch, by adding in plate tectonics. Now, I did ...
46 views

Is it feasible to have an oxidizing planetary atmosphere without the presence of an organic photosynthesis of some kind on the planet?

With the emergence of cyanobacteria on earth 3.5 billion years ago, the shift from a reducing to an oxidizing atmosphere began. “The atmospheric O$_\textrm{2}$ levels (in PAL; i.e., normalized to the ...
48 views

Weather with extreme seasons

Assuming the axial tilt of the Earth was increased to roughly 30°, and the orbital eccentricity roughly doubled(0.03 as opposed to 0.016) so that the average temperature stayed the same, but the ...
121 views

There are some things I don't understand. So far I have my map pretty developed but I think I made some mistakes and there are places I am not sure about. I know I made some mistakes with ocean ...
98 views

How to Calculate Apparent Magnitude/Brightness of Planets from Within the same Solar System

I'd like to be able to determine the appearance of the night sky from an Earth-like planet, in a solar system with multiple other planets, moons, and other bodies. Here on Earth, we can directly ...
66 views

What would be needed to have a database that contained information on people with powers in a post-apocalypse?

For a post-apocalyptic world I'm writing, I have a bunch of, essentially, demons that have killed a large majority of humanity, destroying almost everything in that stands in their way, whether that ...
66 views

Alternative evolution mechanisms using cell fusion

I am trying to understand if it would be possible for organisms to evolve by different means other than random mutations and natural selection. Eukaryotes were predicted to be formed by fusion with ...
111 views

What would a thicker atmosphere do to plant growth/evolution?

I'm working on a concept for a habitable world with venus-like atmospheric pressures, where humans have settled onto huge tabletop mountains where the atmosphere isn't as crushing. This is a ...
115 views

Binary Star System Build - Alpha Centauri

I'm not sure if this site or Astronomy would be better, but I figured I would try here instead. I am attempting to create a [semi]plausible star system in Alpha Centauri for a series. The system was ...
136 views

Dinitrogen monoxide as a gaseous oxidizer for life

Could alien life use nitrous oxide, N2O, as its oxidizing gas, like oxygen on earth? What biochemical reactions would be needed to produce and utilise this gas? I've also heard conflicting messages, ...
149 views

How much aqua regia should a dragon store?

So, dragons are hexapodal creatures, slightly larger than most draft horses (around 190-200 cm at the withers). Compared to the Quetzalcoatlus, dragons have twice the muscles mass in the pectoral ...