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Q&A Can a planet's axial tilt naturally change a meaningful amount in only 100 years from its current cycle?

Could a planet's axial tilt change a meaningful amount (what is needed to make inhospitable biomes even more inhospitable: hotter dry hot desert, colder north) over an extremely short period (~100 ...

2 answers  ·  posted 7y ago by Hankrecords‭  ·  last activity 7y ago by Hankrecords‭

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Q&A Could anabolic steroids be used among colonists in a low gravity environment to prevent extreme atrophy?

Is it conceivable that colonists/astronauts on a long term mission in a low gravity environment might use a low dose of an anabolic steroid (such as Equipoise) to prevent extreme atrophy in their m...

3 answers  ·  posted 7y ago by Mike Ackerman‭  ·  last activity 7y ago by Mike Ackerman‭

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Q&A Given an apparent solar brightness of <30% Sol from Earth, how differently would plants evolve?

Though my star is 1.71 LSol, my planet orbits at about 2.14 AU. Following a back-of-the-envelope equation for apparent brightness, this gives the surface of my planet approximately 30% of Sol's lig...

3 answers  ·  posted 7y ago by Rúnatál Davino‭  ·  last activity 7y ago by Rúnatál Davino‭

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Q&A What sort of life could live in an ocean with no bottom

What sort of life could live in a ocean with no bottom. In this scenario, there is no seafloor, no matter how far down you go. Once you exit the continental shelf, it plunges straight down into inf...

3 answers  ·  posted 7y ago by genericaccount‭  ·  last activity 7y ago by genericaccount‭

Question biology xenobiology
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Q&A Why can an elf never become overweight?

Elves and human share many similarities, from body type to the ability to perform magic. However, elves retain a slim, lean build throughout their life, and are incapable of becoming obese. The big...

9 answers  ·  posted 7y ago by System‭  ·  last activity 7y ago by System‭

Question biology
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Q&A How would you make a planet have more lightning storms

If I were to have a generally earth like world, with water and land masses very similar, what could you add to make storms happen more often, and more specifically, lighting storms. I know lightnin...

3 answers  ·  posted 7y ago by Syro33‭  ·  last activity 6y ago by Syro33‭

Question weather
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Q&A What should seas be filled with to make boats impossible without balloons

Boats and balloons both work because of buoyancy - they are pushed up by a force equal to the weight of displaced water/air respectively. I want my (otherwise earthlike) planet to have 'seas' of a ...

6 answers  ·  posted 7y ago by F. Name‭  ·  last activity 7y ago by F. Name‭

Question earth-like earth
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Q&A How large can an apparent size of a moon be?

In a lot of media one can see moons or other planets that cover a significant portion of the sky (like the background on this page for example). This could be because the moon is actually large or ...

2 answers  ·  posted 7y ago by Maxim‭  ·  last activity 7y ago by Maxim‭

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Q&A Foam-like water

What can cause water to be foam-like, in lumps, but still liquid? Something similar to goo (jelly like but liquid and opaque)? I have a planet and such kind of water, which is drinkable and the te...

5 answers  ·  posted 7y ago by SovereignSun‭  ·  last activity 7y ago by SovereignSun‭

Question planets water
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Q&A Are there any benefits to a large body of water in a space habitat?

The classic example of a cylindrical space habitat, Clarke's Rama, has a 10 km-wide ring of water at the middle. Most depictions of this O'Neill-style of habitat do something similar, placing a lar...

9 answers  ·  posted 7y ago by rek‭  ·  last activity 6y ago by rek‭

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Q&A If all the water on earth were to be displaced into the atmosphere creating a water canopy, how thick would it be?

If the water on earth were displaced to surround the earth in the atmosphere to create a water canopy, how thick would that canopy be? I apologize I should have been more specific in my original qu...

4 answers  ·  posted 7y ago by P.reid‭  ·  last activity 6y ago by P.reid‭

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Q&A How would a species similar to the Rito from BOTW evolve?

When I played Zelda: Breath of the Wild and met the heavily redesigned Ritos, I took an immediate liking to their designs. Although the fact that they're fully bird-like helps, it's mostly because ...

3 answers  ·  posted 7y ago by TGCF ‭  ·  last activity 7y ago by TGCF ‭

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Q&A Lead as a nuclear fuel

On a timescale of 1e11 years, all uranium and thorium will have decayed, but planets will still exist, orbiting red dwarf stars. Would it be possible to use lead as a nuclear fuel? In principle, t...

4 answers  ·  posted 7y ago by rwallace‭  ·  last activity 7y ago by rwallace‭

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Q&A Can extremely powerful geomagnetic storms be made plausible on an otherwise Earth-like world?

I've been playing with ways to make my world interesting, and also further justify the limited use of ferrous metals. One idea I had was that my world might undergo regular and intense geomagnetic ...

2 answers  ·  posted 7y ago by Random‭  ·  last activity 7y ago by Random‭

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Q&A Without making any changes to the human neck, how large of horns could a human being support?

One of the first things noted about pretty much any humanoid race with horns or antlers is that the neck would not be able to support the weight, making the idea unfeasible. However, some horns are...

3 answers  ·  posted 7y ago by Pleiades‭  ·  last activity 7y ago by Pleiades‭

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Q&A Purple soil - how would it be possible?

For one of my projects, I'm developing an inhabited Earth-like world, with the key visual difference being that much of the land is purple, instead of the brownish colour it is on Earth. My questio...

13 answers  ·  posted 7y ago by F1Krazy‭  ·  last activity 6y ago by F1Krazy‭

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Q&A How could polycephaly evolve as a byproduct of natural selection?

Why this question is different from existing questions... The closest question to mine is Anatomically Correct Cerberus. It is clear from the answers to that question and indeed it's axiomatic to ...

20 answers  ·  posted 7y ago by Arash Howaida‭  ·  last activity 6y ago by Arash Howaida‭

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Q&A How to replace a fictional element to the periodic table?

From what I know about the periodic table, in order to add a new element it would have to be above the current highest element. And up there this new element would be unstable. But could I just re...

14 answers  ·  posted 7y ago by Shyassasain‭  ·  last activity 5y ago by Shyassasain‭

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Q&A Can this type of winged humanoid possibly work? See diagrams

So, I don't believe that the "angelic" type winged human can exist (y'know, the kind with the feathery wings sprouting from the back). Too many problems of anatomy, weight, etc. But I am trying to ...

1 answer  ·  posted 7y ago by Len‭  ·  last activity 7y ago by Len‭

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Q&A If all the iron and nickel in the inner core was transmuted into gold over two weeks

If some kind of insane wizard began a ritual that would turn the inner core of the earth into gold, what would happen? Over the course of 15 days, the entirety of the core will become gold. Each ...

4 answers  ·  posted 7y ago by Piomicron‭  ·  last activity 7y ago by Piomicron‭

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Q&A Dwarfs can live for hundreds of years, but how? (Dermatologists hate them!)

From the dawn of fantasy fiction, dwarfs have most often been described roughly in the same way: short and stocky, long beards, can smith stuff, good fighters, can live for hundreds of years aging ...

3 answers  ·  posted 7y ago by Hankrecords‭  ·  last activity 7y ago by Hankrecords‭

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Q&A Reality Check: Are these Honey Mouths and Thorn Shredders realistic?

On an hot planet at the wooded poles are two aliens species that coexist in a mutually beneficial relationship. The Honey Mouths use gecko-like feet to hang from the far larger Thorn Shredders, wh...

1 answer  ·  posted 7y ago by Dan Clarke‭  ·  last activity 6y ago by Dan Clarke‭

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Q&A How would a Lunar Calendar be set up with 2 moons?

So I have a super-Earth that has 2 moons. Moon 1 is a bit smaller than our moon, and has an orbital period of 19.25 earth days. Moon 2 is larger than our moon and has an orbital period of 147.15 da...

3 answers  ·  posted 7y ago by Redwolf‭  ·  last activity 5y ago by Redwolf‭

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Q&A Terminology for 24 hour wake-sleep cycle on world with longer dark-light cycle?

Take the Jovian moon Ganymede as a real-world example. It has an orbital period of ~7 days around Jupiter, which is effectively its day and its year simultaneously. My characters will need the wo...

13 answers  ·  posted 7y ago by Pasqueflower‭  ·  last activity 7y ago by Pasqueflower‭

Question moons day-night
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Q&A How to keep my colonists primitive?

The story will take place near a galaxy filled with space faring civilizations. In this galaxy, a small group of scientists realize that their side is on the losing side of a war that will probabl...

18 answers  ·  posted 7y ago by Jim Wolford‭  ·  last activity 6y ago by Jim Wolford‭