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Q&A What does my dragon sound like?

Your dragons are self-sustaining MIDIs and synthesizers. They sound like a slightly artificial version of any noise on the planet. All human languages, the output of all instruments, all birds, ...

posted 5y ago by Cyn‭

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Q&A Could DNA Survive in Outer Space?

Traveling outwards from the Earth in plastic bags in a tube, it would survive minutes, 'till the bags heated up in the solar radiation, burst and the whole of the inside of the tube was filled with...

posted 5y ago by Mr Bumble‭  ·  last activity 5y ago by Mr Bumble‭

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Q&A Could DNA Survive in Outer Space?

Blood is not the best substance here. Most of the tests for genetic genealogy and genetic medical testing use saliva or epithelial inner cheek cells. Saliva officially lasts for about a year if p...

posted 5y ago by Cyn‭  ·  last activity 5y ago by Cyn‭

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Q&A How long a human being could live with stem cells?

How long a human being could live with stem cells? Science-based and the science-fiction tag, hmm. If the science is right and with some restrictions, perhaps forever barring physical assault...

posted 5y ago by Mr Bumble‭  ·  last activity 5y ago by Mr Bumble‭

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Q&A What could make a ship made of pumice seaworthy?

Pumice is composed of highly microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock...It forms when volcanic gases exsolving from viscous magma f...

posted 5y ago by Cyn‭

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Q&A How close could a planet get to a super massive black hole before being destroyed

You want to know how close your planet would get to a supermassive black hole. The Planet wouldn't get near the black hole itself. Not even near the Roche Limit. And I'll prove it. The vicinity...

posted 5y ago by Mr Bumble‭  ·  last activity 5y ago by Mr Bumble‭

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Q&A What light colors/bulbs should be used inside a spaceship?

LEDs LEDs are currently the most energy efficient readily available lighting system. Better things may come along, but the reason you read about fluorescent light bulbs in older novels is because ...

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

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Q&A What mechanism can prevent super-healing heroes from accidentally budding?

Cells are semi-psychic Each cell emits a small psychic aura, which is strengthened by the cells around it. This aura operates outside the realm of physics (On another plane of existence, perhaps?)...

posted 6y ago by Andon‭

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Q&A Radiation Levels and Effects on Planet with 27 Suns

Let's look at two key equations: $$F_i=\frac{L_i}{4\pi r_i^2},\quad \lambda_{\text{max,i}}=\frac{b}{T_i},\tag{1, 2}$$ For a given star with luminosity $L_i$ and surface temperature $T_i$ a distance...

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

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Q&A Write once perpetual storage, is such a thing possible?

Since you say in a comment that you're willing to settle for a combination of tamper-evident and write-only unless tampered with, as opposed to strictly tamper-proof (which indeed is a much harder ...

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

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Q&A How much organic matter is required to make a clone?

There are a few things that you'd need to be able to clone a creature. One thing is a sample of intact DNA. If stem cells can be acquired to get it this would be better, as mature cells are specia...

posted 6y ago by AndyD273‭

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Q&A How could intelligence be balanced with a large muzzle?

A plausible reason for the negative correlation between anthropoid muzzle size and brain size is quite simple, the higher the intelligence, particularly if high enough to cook, the less need there ...

posted 6y ago by Amadeus‭

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Q&A How can I find local stars that are 'gravitationally bound', i.e. moving together?

TL;DR There are several important factors considered when trying to determine if a group of stars are actually from the same stellar cluster, moving group, or association: Kinematics. Do the sta...

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

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Q&A Is a ring planet possible?

This would not naturally work the way that you describe. Saturn has rings because the ice and rocks that make it orbit the mass of the planet. Without that mass, say if Saturn were to fall into a ...

posted 6y ago by AndyD273‭

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Q&A Simulating gravity in a gravity-less universe

TL;DR Your world will experience constant, uniform gravity. Everything is accelerating upward at the same rate - but this isn't the case in our universe, as gravity follows (approximately) an inve...

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

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Q&A Tiny galaxies with exoplanets

Galaxy size The first question is whether such a galaxy (less than 3000 stars) is possible. The clear answer is yes; Segue II already satisfies those requirements. Segue I and Willman I appear qui...

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

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Q&A Are there alternative ways aliens would think and feel emotions?

I don't think you are thinking about thoughts correctly. I am an AI researcher, familiar with the field. It is provably true that the human brain uses sensory information to discern patterns; about...

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

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Q&A Building a planet with a primordial black hole core

Mass The big issue here lies in determining the mass of these black holes. On the one hand, the traditional primordial black holes you mention - formed by density perturbations - occupy a relative...

posted 6y ago by HDE 226868‭  ·  last activity 5y ago by HDE 226868‭

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Q&A Is there a habitability zone between the primary and secondary stars of a binary star system?

Yes, there is a habitable zone. Known examples of possibly-habitable binaries I have to disagree with StephenG's answer; we have data that indicates that this is possible for similar, Sun-like st...

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

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Q&A What is the evolutionary advantage of albinism in cave-dwelling animals?

Best use of available light Caves are naturally dark. But sometimes there is a little light - either reflected from the entrance to the back of the cave, phosphorescent minerals, or perhaps artifi...

posted 6y ago by manassehkatz‭

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Q&A How far can civilization go without inventing the calendar?

As far as you like, the calendar is not that important. It also depends on what counts as a calendar! The reason the constellations tend to not look anything like a description of their names, w...

posted 6y ago by Amadeus‭

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Q&A Which part of the universe would make celestial navigation most difficult for a planet?

A swiss cheese-style dark nebula Celestial navigation requires seeing other objects in the sky. But you can't do much of that if you can't see many celestial bodies. Therefore, you need to place y...

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

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Q&A Is the idea of being "fused" to/into a material as a result of a teleportation accident plausible?

My first thought was that the saying that we're "99.999% empty space" would easily solve this problem. The atoms would just push each other around a bit, and the parts that intersected the wall wou...

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

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Q&A Multiple moons but only one of them is tidally locked to its planet?

The time it takes a moon to become tidally locked to a planet depends on a number of factors. In particular, $$t_{\text{lock}}\propto\frac{\omega a^6}{m_p^{2}}$$ where $\omega$ is the moon's initia...

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

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Q&A Chlorine Trifluoride-producing microorganisms

This isn't going to happen, for a number of reasons (all of which boil down to "It's dangerous, and these bacteria will kill their hosts"). Organic materials may "spontaneously ignite" when they ...

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

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