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Q&A Can a fission satellite duplicate the radiance frequencies of a star?

Option 1: Continuous spectrum Your first choice would be to recreate the black body spectrum of the star. For a black body at a temperature $T$, the intensity $J(\nu)$ is $$J(\nu)=\frac{2h\nu^3}{c...

posted 6y ago by HDE 226868‭

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Q&A Virtual Reality and Physical Trauma

Like Cort Ammon says, it would depend on how your VR functions. The brain has mechanisms that prevent what's going on in your brain to affect your body in any way: that's what happens when you're d...

posted 6y ago by Galastel‭

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Q&A What would be needed for the entire planet to have a polar climate?

If a planet is far enough from its star, it will be cold, water will be frozen etc. To have plants, you'd need liquid water for at least part of the year (something like the tundra, at least.), or ...

posted 6y ago by Galastel‭  ·  last activity 6y ago by Galastel‭

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Q&A How long would life on Earth survive without any animals?

If all the fauna on earth has been killed (vertebrates and invertebrates), there are no pollinators left. Which would kill off many plants. (That is, make them unable to reproduce, so once they die...

posted 6y ago by Galastel‭

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

There are some places on Earth that have an unusually high frequency of lightnings. For instance, Venezuela. The explanation, in this case, consists in moisty air locked by mountain ridges, and the...

posted 6y ago by _X_‭

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Q&A What effect will mining on the Moon have long term?

Mining on the moon would remove some mass, but I don't think you'd notice. First mining on the moon probably won't involve strip mining and hauling all of the material away. Instead rock will be du...

posted 6y ago by AndyD273‭  ·  last activity 6y ago by AndyD273‭

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Q&A The Least Interesting Substance

It's deactivated Grey goo, Smartdust, Programmable matter, Computronium, or something like that. Basically trillions of nano machines that at some point in the past ate the planet and converted i...

posted 6y ago by AndyD273‭  ·  last activity 6y ago by AndyD273‭

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Q&A Could soft matter infused with nano or pico sized magnets be used to clump together so that we could create environments with it?

Assuming there is a possibility that the inhabitants had full molecular nanotechnology, it could be an underwater version of a utility fog. Basically lots of little 12 sided nano machines, with ...

posted 6y ago by AndyD273‭

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Q&A Methane Dragons

Your dragons are vegetarians and have a lot of different stomachs - just like cattle To cite from the Wikipedia article on cattle (emphasis mine): Gut flora in cattle include methanogens that ...

posted 6y ago by Secespitus‭

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Q&A Why can't spaceships go underwater?

Spaceships are not supposed to withstand a lot of external pressure Have a look at our sister site Space.SE and the question Do spacecraft have similar structural integrity requirements as submari...

posted 6y ago by Secespitus‭  ·  last activity 6y ago by Secespitus‭

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Q&A Generating and storing power in a post-apocalyptic world

Aqua power is going to be the easiest to harness, especially with the (Personal opinion: Ridiculous) restriction of no mining. Without any organized industry (Opinion the same as the above), you c...

posted 6y ago by Andon‭

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Q&A How can I make a planet covered in ice with an ocean beneath the surface?

1. Orbit a high-mass planet In the Solar System, two moons are covered with ice and have subsurface oceans: Europa and Enceladus. Europa orbits Jupiter; Enceladus orbits Saturn. In the case of the...

posted 6y ago by HDE 226868‭  ·  last activity 6y ago by HDE 226868‭

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Q&A How to differentiate between elves and men

So they essentially look the same, minus the ears, live the same length, have the same magical aptitude... Am I right in understanding that you just want it to be like different dog breeds? If so t...

posted 6y ago by AndyD273‭

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Q&A How to differentiate between elves and men

You could make a different colour scheme for your elves: just as humans are all shades of brown (from pinky-beige "Caucasian" to dark), with pink or yellow undertones, your elves could be different...

posted 6y ago by Galastel‭

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Q&A Train-World: The shatterpated machinations of Spoorcaneers - Tossing & Turning

So, to get a couple comments out of the way first, I'm not really sure why you would want to rob the train from another train (except for the rule of cool), especially since they are traveling so s...

posted 6y ago by AndyD273‭

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Q&A Methods for simulating low gravity on high-g planets

Do it the way NASA did it in the 1960s -- with ropes and pulleys! No, really. I distinctly recall seeing a video clip, but can't recall exactly where, of how Apollo astronauts trained for walking ...

posted 7y ago by Canina‭

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Q&A How can my dragon convert heat to usable energy?

Try thermosynthesis. Thermosynthesis is a hypothetical mechanism, usually applied to the RNA world theory for the rise of life on Earth. In a nutshell, it states that an organism could function as...

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

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Q&A Fact-based fiction: Electric, no-fuel propulsion for autonomous space drone

Any light source is a propellant-less drive (often called a "photon drive"), it's just extremely energy inefficient. With perfect conversion efficiency, the impulse of the device is (energy suppli...

posted 7y ago by dmckee‭  ·  last activity 7y ago by dmckee‭

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Q&A Fact-based fiction: Electric, no-fuel propulsion for autonomous space drone

I'd suggest the simplest and cheapest of them all: gravity. Recall that gravity pull is zero only at infinite distances. For convenience of the story, the drone will always be under the gravity pu...

posted 7y ago by _X_‭

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Q&A How will birds be different on a <1g world?

There will be little difference. The lower atmospheres are the same. Let's assume that the atmospheric pressure, $P$, follows a simple exponential scale height model: $$P=P_0\exp\left(-\frac{z}{H}...

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

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Q&A What could cause the world to be almost completely submerged in water, naturally or man-made?

The idea of an ocean planet isn't too far-fetched. There are several moons in the Solar System - Enceladus and Europa, for instance - that have subsurface oceans. If the ice covering their surfaces...

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

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Q&A What would be different if a person has broader visual spectrum than normal

I have aphakia, so I can address the near-UV end from personal experience. For the near-IR, I can only reason from other sources. In daylight, subtle effects like the patterns on flowers mentione...

posted 7y ago by Monica Cellio‭  ·  last activity 7y ago by Monica Cellio‭

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Q&A How can I make manure without cows?

Use chicken manure. Other animals, besides livestock, also produce good manure, with different qualities. Now, not all manures are created equal; they differ in composition, volume, and production...

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

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Q&A What could be an event which would wipe out most life on Earth and cause massive changes to Earth's ecology, but which humans can survive in bunkers?

To create a complete new biochemistry, we are going to make carbon-carbon bonds obsolete. Carbon-carbon bonds are the backbone of our carbon-based life. To make them obsolete, we will force life to...

posted 7y ago by _X_‭

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Q&A How long would it take a civilization to see and understand a Dyson ring?

Anywhere from ancient times to the present. Question 1: Is there anything there? (answered pretty quickly) Sunspots, for instance, were first observed by the Chinese in 364 B.C., two millenia bef...

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

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