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Q&A Under what conditions would humanoids evolve eyes in the backs of their heads?

Many creatures - humans among them - have binocular vision, where two eyes side by side allow good depth perception. There are quite a few other advantages over one eye, including a larger field of...

13 answers  ·  posted 7y ago by HDE 226868‭  ·  last activity 7y ago by HDE 226868‭

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Q&A Does the interior surface of a Dyson Sphere exert gravity?

The interior of this particular Dyson Sphere is so large that it encapsulates a star at its center. Otherwise it is filled with breathable air which creatures can breath and fly in. I imagine that ...

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

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Q&A Is this coral lagoon geologically possible?

BACKGOUND I'm working on a region for my world, and I have a very distinct idea of what I want the physical landscape to look like. Below is a description of what I'd like for the land, and an app...

4 answers  ·  posted 7y ago by Random‭  ·  last activity 5y ago by Random‭

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Q&A Effects of severe radiation storms?

I've got this planet that orbits it's star slightly closer than earth orbits the sun. For story reasons I need it to have small yet severe radiation storms and I was thinking that either a weak or ...

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

Question space planets
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Q&A Only Three Books: Restarting Chemistry after civilization collapses

Global famines have dropped the population to 1 billion people and global civilization has collapsed. In an effort to save future civilization some time, you want to provide some information to ki...

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

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Q&A Long term effects of erosion

What could be the effects of erosion on a rocky Earth-sized planet on a universal time scale (in the order of $10^{40}$ years)? Let's assume that: The source of sunlight is endless and almost con...

5 answers  ·  posted 7y ago by Francesco Manzali‭  ·  last activity 7y ago by Francesco Manzali‭

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Q&A Train-World: Storing RHUs for decades to centuries

...no, I mean, supposedly, I believe there is more about it than mere kans on our part. Installations like this one are found all along the spoorwegs, and yes, around some you should tread light...

3 answers  ·  posted 7y ago by dot_Sp0T‭  ·  last activity 7y ago by dot_Sp0T‭

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Q&A How do I increase air pressure for the planet Mars?

Introduction For more backstory, see here and here The 438th Harmonious Congress of the People of Mars was perhaps the most anticipated since the early years of the settlement. In a rare action, ...

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

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Q&A What tests to select for advanced intelligence in wolves?

Say I want to make wolves intelligent like people, to create a Canis Sapiens of sorts. What sorts of tests should I conduct to develop human-like intelligence? If it helps, the sort of traits I'...

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

Question biology evolution
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Q&A Habitability of a world inside a dark nebula

For your consideration, a star system inside a dark nebula with a potentially habitable planet. Being a dark nebula, we Earthers can't see light shining behind the nebula. Further and therefore: ...

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

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Q&A What would the temperature variation be on this planet? (High eccentricity & slow rotation)

I've been trying to figure out a model (or find a relevant paper) for calculating the approximate day/night and periapsis/apoapsis temperature variation for an earth-like planet that has a high ecc...

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

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Q&A Numeral system for a species with 8 fingers

In a nutshell, I've an 8-fingered bat-like humanoid (let's call them AX) and a 10-fingered 'standard humanoid' species (let's call them BX) sharing a planet. AX was the first to develop things su...

10 answers  ·  posted 7y ago by Tero‭  ·  last activity 7y ago by Tero‭

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Q&A What whould a doctor notice about a person from a 3g world given normal height/ weight

Background info During physical examination A physical examination may include checking vital signs, including temperature examination, Blood pressure, pulse, and respiratory rate. The healthc...

4 answers  ·  posted 7y ago by Randy Lowther‭  ·  last activity 7y ago by Randy Lowther‭

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Q&A What is the smallest geological change possible to make human evolution untraceable?

Human evolution has a reasonably complete fossil record pointing to the fact that we and apes evolved from a common ancestor within the last 10 million years or so. But I want a world where it coul...

11 answers  ·  posted 7y ago by kingledion‭  ·  last activity 7y ago by kingledion‭

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Q&A How to produce enough power to create a pair of proton-antiproton?

I've recently discovered something great: the Schwinger effect. It says that if you concentrate enough power thanks to laser into a single point in space, it will spawn a pair of proton and antipro...

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

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Q&A How do you determine placement of multiple lunar bodies in the night sky?

One of the worlds I'm building has three moons in 1:2:4 resonance, with the full moons syncing up once a cycle, meaning all three are full at different times but at the same time when the moon with...

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

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Q&A What kind of planetary conditions would prevent or severely limit air travel?

So I have a planet that is slightly larger than Earth, orbits an orange star slightly closer than earth orbits the sun, has extreme weather patterns and volatile tectonics. It has bad storms, tempe...

10 answers  ·  posted 7y ago by Nick‭  ·  last activity 7y ago by Nick‭

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Q&A Planet Titan, could this work?

So I'm guessing you guys know about the speculation that life exists on Titan. To me, this is very interesting but many point out that it would probably only be microbes and unicellular life becaus...

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

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Q&A Could Cerberus be a pack animal?

So I've created a Cerberus creature that is a group of three hyena-like dogs instead of one organism. The three individuals are linked together, much like an ant colony or bee hive. They would be l...

2 answers  ·  posted 7y ago by Nick‭  ·  last activity 6y ago by Nick‭

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Q&A The Planet Walkers - Feasibility

A nomadic tribe exists deep in the vastness of space, calling a rogue celestial object home. Their Skywatchers have seen another lonely object that will cross paths with theirs, so they begin prepa...

3 answers  ·  posted 7y ago by Austin A‭  ·  last activity 7y ago by Austin A‭

Question space reality-check
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Q&A Life on a water-ball planet

I'd like to explore some details on a so-called water-ball planet (i.e. a planet in the habitable zone of a sun, covered by a 100 km deep ocean). I am particularly interested where life could devel...

1 answer  ·  posted 7y ago by jk - Reinstate Monica‭  ·  last activity 7y ago by jk - Reinstate Monica‭

Question planets life
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Q&A Would it be possible to lasso an emu-like bird without harming it?

Think Moa, very big bird, kept as livestock in a western-ish world. Could they be safely lassoed? Their necks are quite long and, I imagine, delicate, at least when compared to cattle or horses. If...

1 answer  ·  posted 7y ago by Rebecca Hancock‭  ·  last activity 7y ago by Rebecca Hancock‭

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Q&A Immediate physical effects of being exposed to space for nine seconds?

I am writing a short story in which a character is ejected out of an air lock in a space ship. He quickly re-enters (disregard how he does this) and the chamber re-pressurizes, but he is exposed to...

2 answers  ·  posted 7y ago by Thomas Myron‭  ·  last activity 7y ago by Thomas Myron‭

Question space reality-check
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Q&A How powerful a microscope could my pyromancers make?

BACKGROUND In the antiquity of my world, a college of pyromancers attempted to create stronger magnifying lenses so that they could apply their ability to control heat to ever more finely detailed...

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

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Q&A How could a small human sized humanoid creature hang upside-down?

I am looking to have a creature which is basically a small human sized bat, something like man-bat from the batman series. It would ideally fly or at least glide and would regularly hang upside dow...

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