If they fall down to earth does that mean they come crashing down on land or sea? And isn’t that dangerous threat to people who may be on ground or maybe a ship like a Cruise ship?
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Some parts of rockets are calculated to fall back to earth, like the space shuttles’s reusable boosters and space-x’s self landing boosters.
Some are calculated to fall into remote parts of oceans where you won’t find cruise ships or anything else. Such areas are sometimes specified in “notices to mariners” that tell shipping about areas that are at risk.
Much of the debris burns up on re entering the atmosphere and never reaches the surface.
Some remains in orbit as space junk. The biggest bits of junk are tracked so that other space craft don’t hit them.
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