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Posts by AndyD273‭

221 posts
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Q&A How can you have dualism in Hard SF?

Several scientific theories predict the presence of extra higher dimensions. Physics has validated (or at least not falsified) a 4 dimensional (3+1) model of space-time, and if string theory is cor...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A How to knock down humanity?

I believe that an EMP attack would do what you want. 8-10 bombs launched on scuds from container ships and set off in low earth orbit, evenly spread around the north and south hemispheres, would ta...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Is it a forgone conclusion that any exo-bacteria discovered on an alien, albeit Earth-like planet will be deadly to human life?

Humans are basically warm bags of slightly salty water. If an exo-bacteria can grow on your skin, there isn't much stopping it from growing inside your body. Your immune system could give it prob...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Orbital period of a tidally-locked Earth-like planet around a red dwarf

As far as I can tell, the habitable zone around a red dwarf is less than .5 AU, and is going to be very narrow. The exo-planet Gliese 581 g is right in the middle of the habitable zone of the st...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Are space stations like Sevastopol (Alien Isolation) realistic?

The benifit of the O'Neill cylinder is that you can get spin gravity by rotating it. The Alien universe has artificial gravity, so space stations can be more like the one in the picture without h...

posted 8y ago by AndyD273‭

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Q&A How would plants that moved like animals change the world?

Farming would look a lot more like herding. This would be interesting because you could drive your crops to market, let them out to pasture, etc. Picturing cropboys driving potatoes from Idaho to ...

posted 8y ago by AndyD273‭

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Q&A Alien analogues to the vertebrate ear?

Possibly by detecting resonance on a membrane through nerve signals. Sound is vibrations in the air, and when those waves run into things you get vibrations. Human skin is sensitive to sound to...

posted 8y ago by AndyD273‭

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Q&A Best kind of creature to be capable of biologically spawning an 'ecosystem' with borrowed organic tissues?

So after some consideration, this is what I've come up with. Sort of a half plant half animal hybrid similar to a sea anemone. Maybe slightly more mobile like a sea slug. It would have a wide ...

posted 8y ago by AndyD273‭

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Q&A Neutron Star materials - If a neutron star stops spinning, What will be the characteristics of the materials in it?

Neutronium probably isn't the material that you want to use if you want to keep it even slightly plausible. It can't exist outside of a neutron star that has less than 2 solar masses squeezed into ...

posted 8y ago by AndyD273‭

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Q&A Gravitational slingshots: could they be used to decelerate a spacecraft traveling at a small fraction of light speed?

Yes, in theory. Gravity assist braking is a thing The problem is the speed. Going that fast you'd need to do a lot of maneuvers in order to lose enough velocity to enter orbit around the sun, a...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Scientifically-plausible alien telepathy

One evolutionary path is if the fungus communicated using EM signals. Electrical synapses use electricity instead of chemicals to communicate with each other. This typically means that they have to...

posted 8y ago by AndyD273‭

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Q&A Is it possible to communicate through DNA?

There isn't a reason why not. Computers communicate with just 1 and 0. DNA has 4 chemical bases, and humans have around 3 billion base pairs. There are sections of human DNA that are left over f...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A How to improve manorial living with modern low-tech innovations?

Some of the things they could do are modern takes on ancient techniques. For instance crop rotation and allowing the land to rest once in a while. We know that if you plant the same crop year af...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A How to effectively slow down a ship about to shoot through the Solar System at 0.6c?

At .6c you aren't going to get much that will slow it down in only a year. You can try lasers if you already have them in place, as it might knock a percent or two off, but considering for a lase...

posted 8y ago by AndyD273‭  ·  last activity 6y ago by AndyD273‭

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Q&A How can someone be invulnerable to any damage down to cellular levels while still having a limited lifespan?

There was an article by Brandon Sanderson about how superpowers are basically magic. If you want Wolverine style healing, where you could burn him down to a skeleton with a few gristly bits and he'...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Is the Idea of a Collective Consciousness Realistic?

In a small way this happens already. Weaver ants have a very complicated communication system using pheromones that allows for an unusual amount of cooperation. A lot of that is hard wired into ...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A How feasible is it for authorities to track down a spy from signal leakage of a tightbeam transmission?

Since the spy is communicating with a satellite, they need to to have a view of the sky, and be pointing the beam up which may reduce the amount of leakage down on the ground if the transmitter is ...

posted 8y ago by AndyD273‭

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Q&A What knowledge would you need to survive a fall from low-orbit?

Deorbiting is actually pretty easy, and doesn't even need a magic space suit. You could provide him with something like the MOOSE, or even just the materials and a set of plans to build one, and...

posted 8y ago by AndyD273‭

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Q&A Is it worth colonizing a planet that travels near the speed of light?

As a few of the others have said, due to time dilation, this planet wouldn't be very useful as a colony. Between the speed and the proximity to the SMBH, it would probably be one of those situation...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A Is there a way to "poison" oil fields permanently without releasing CO2 from them?

They could be incompetent or short sighted eco terrorists, and it doesn't matter that they use a method that would release a lot of co2. "We destroyed the oil by pumping oil eating bacteria down! ...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A How would plants survive an extremely long, cold night

Most plants would rely on seeds, and would have multiple cycles during the 39,420 hours of daylight. The seeds would probably have some temperature sensitivity so as to not germinate just before du...

posted 8y ago by AndyD273‭

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Q&A How could Life develop on a planets with 9 year days

The idea of volcanic vents to harbor life during the long night that others have suggested is really good. But that won't help during the long day if it gets to hot and dry. One variable that woul...

posted 8y ago by AndyD273‭

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Q&A Practical problems of near-light-speed travel

AndreiROM is right, thanks to our friend inertia the only time you'd notice anything is while the ship is actively thrusting during acceleration and deceleration, or if you turned really sharply. ...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A What can cause the aliens not to understand our signal?

First off, the aliens aren't that far away, relatively speaking. Most of our signals are pretty weak, especially compared to the radio output from our sun, and you'd have to be pretty close and...

posted 8y ago by AndyD273‭  ·  last activity 8y ago by AndyD273‭

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Q&A An armor that deflects any physical forces against it

Like we learned in Dune, the slow blade penetrates the shield. Anything moving faster or with more force than the threshold is going to rebound. Arrows would be shot backward at speed, swords swun...

posted 8y ago by AndyD273‭

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