what if we nuked every planet
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Mercury: new crater
Venus: new crater, radioactive fallout spreads throughout the atmosphere. This will be detectable by scientists for thousands of years.
Earth: You’ve already violated the outer space weapons treaty by detonating nuclear bombs on Mercury and Venus, but if you did it on Earth, you would seriously risk starting a nuclear war. At the very least it would be a major story, and if you were found to be the cause, you would probably be arrested for treason, or killed or something.
Moon: new crater
Mars: new crater, radioactive fallout spreads through the planet’s surface.
Ceres: new crater, and possible formation of a new cryovolcano. Ceres’ interior is thought to contain lots of hydrated minerals and water, so blasting a hole in the crust might cause a lot of outgassing of water.
Jupiter (and the other gas giants): The blast wave would expand throughout the atmosphere without really affecting much. The radioactive fallout would be detectable for some time, but Jupiter’s atmosphere will convect the fallout deep into the planet and it will become undetectable before too long.
Europa: The ice crust of Europa is several miles thick in most places, but if you found a particularly thin bit of crust, perhaps you could create a liquid water plume! You’d irradiate any of the living creatures that might (or might not) come out of that plume, but mostly that’d be from Jupiter’s intense radiation belts rather than the nuclear bomb.
Saturn’s rings: the explosion will heat up and vaporize the icy particles surrounding the bomb, but since nuclear explosions are not particularly effective in space due to a lack of air to transfer explosive force, the overall structure of the rings wouldn’t be changed.
Icy moons and dwarf planets: New crater, possibly with a transient cryovolcano.
Answer:
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Nothing will ever happen if you nuke a planet, except from some damage and a few thousand years of radiation. It will also make the said planet little less helpful if we need to ever mine it. Nothing. The gas giants get hit by far stronger impacts than a nuclear missile could provide.
✌️Santa19 ✌️