Would viruses be still a more fierce weapon than prions?
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possibly, but the main advantage of prions is them being insidiously slow and near-impossible to treat
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Not near impossible, pretty much completely impossible.
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Nanobots
(Char limit)
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Oh yeah, nanobots could become stupidly powerful as a doomsday weapon if designed correctly. Just eating the entire planetās surface lol.
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Grey goo sounded very interesting. But I donāt believe it anymore. Firstly, life already uses molecules as its building blocks. You canāt get smaller than an atom. Why should making a machine from silicon rather than carbon make it better? Transistors are 5 nanometers (50 hydrogens across) compared to neurons which are 4 micrometer (4.000 nanometer). But unlike neurons, transistors canāt self replicate. The factories required to build them are much bigger than the nanometer scale.
Secondly, How are you just going to eat rock? Where is the energy coming from? Matter to energy conversion? KLT-40S is 7 meters wide, 11 meters tall. HTR-PM is 3 meters wide and 11 meters tall. How much smaller than a nuclear reactor can a matter to energy rector be? And how do you convert it? Using a kugelblitz? If you have a black hole, why do you need nanobots to destroy a planet?
Letās assume that it is made from carbon rather than silicon. This way, it would have a source of quick energy. It could eat the living beings on the surface. But earthās surface isnāt puddle of pudding. Biomass is concentrated in places called organisms. So whatever self replicating thing you created, it has to travel the distances between these organisms. So it has to haveā¦ legsā¦ waitā¦ If you can release a very hungry monkey, why not release a warplane? Didnāt you just literally come from another planet?
Okay, so, lets use passive travel methods to move into other organisms, rather than walking. And we created aā¦ virus. Masks? Masks. Not deadly.
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Wait, how do real-life nanobot concepts even power themselves?
Chemical energy from digestion for a simple design, diamond batteries for a well rounded one, RTGs for long lasting bots
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fungus that infects through even the smallest cut or mucous membrane it can find, sacrifices itself upon reproducing to release hundreds of billions of spores, is able to switch between carbon based, silica based([1]), and a mixture of both, as well as between different polar solvents based on whatās available, and can also make giant leaves made of cells that basically turned themselves into photodiodes, possibly with even more giant lenses to focus the light, so they can have plenty of energy to fix silica into a form thatās easier to use for reproduction, possibly even a silica based fatty acid analogue, especially since thatād be easy to turn into pure glass/quartz if needed, but could also be used to make lipid membranes, which would make life native to the planet die from eating no matter how much it tried due to a mix of at least two types of biochemistries, and if itās able to digest rocks, anger the fairies in its atoms with the sun, and herd the angry fairies where it needs them to release their anger, it should also be able to have each of its cells independently and/or collectively switch between electrotrophy and every type of heterotrophy, as well as every kind of autotrophy you can think of
planet eating fungi that can infect anything with available calories as a spore, and use the sun to power their rock eating habits. maybe they also have an organ that stores an extremely energy dense compound in an area with a turbine that produces AC and converts it to DC, and combusts it when it needs energy and canāt eat anything at the moment
that would be the best kind of grey goo to unleash on a planet. especially if you give it anything that can turn heat into usable energy like rotation, since it can turn that into atp. if you give it anything like that itāll suck the planet dry before a blue star explodes, and itāll continue surviving as likely the sole survivor of the mass extinction event it caused.
and invasive species can always get worse.
not to be confused with silicon based. as every silicon atom is already bound to an oxygen atom, it takes much less energy to do and is much more stable around oxygen ā©ļø
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Could it be possible to artificially trigger supernovae?
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yep, if the starās mass cant counteract the force pushing out itāll explode, and the inverse maakes it implode then explode, but the first one is more important for an artificially triggered supernova
basically you just need to make sure the star canāt shed enough energy and you inject energy into it with a laser or nukes or something until it blows up, but thereās also the option of attempting to compress it til it explodes, which could probably be done with antimatter bombs
antimatter bombs would also be what youād probably wanna trigger the first kind with tho, so itās better to just go with option 1
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That type of weapon would be stupidly expensive for sureā¦ do we have any alternatives with similar destructive power?
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better, more reliable bet: white dwarfs are probably very often inhabited, and if you dump enough junk in a white dwarf, it goes boom (non-super nova). Downside, if you can throw a mini-nebula at a start, you can probably throw one at a planet, but if theyāve colonized their solar system you can still obliterate them with the white dwarf trick.
by definition not really. Bottled light if that was a sane thing? Really, itād a fusion bomb a order of magnitude bigger, or a nuke the size of a moon for every antimatter blob the size of a nuke. Compressing a star is a very unhinged idea, it isnāt cheap.
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Wouldnāt the helium flash skin the habitable planets of their atmosphere? I can also guess it would get very cold.
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Super Weapon Idea
Big red button that removes life from planet you think of 
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So basically a localised SCP-001-J which destroys a single location and not the whole universe.
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boop
filler and stuff
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What about using strange matter as a weapon? The main feature of strange matter is that it turns baritone matter (this is the familiar matter from which atoms, protons, electrons, etc. are made) into strange matter (that is, into itself), one unit of such matter can turn an entire planet or a star into a piece of strange matter. Theoretically, it is possible to create strange matter by holding it in a container using electromagnetic forces, and then drop this container on a planet or star of a cosmic civilization that we do not like.
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has pretty similar energy to ālets just cause a false vacuum collapse in their territory!ā or āhydrogen bombs are a valid substitution for anti-tank missiles.ā If you want to be the guy to replace their oort cloud with electromagnetic shielding powerful enough to stop strange solar wind and comets and whatnot, great weapon. if you can trigger false vacuum collapse far enough away that dark energy will shove you and your target apart even a bit faster than the speed of light, maybe the most powerful weapon ever. If you nuke a tank, it will in fact break the tank.
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Could there be superweapons which do not kill off a civ species but instead prevent it from developing?
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