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Because satellites are blown up, forming debris, which is called space junk
In a way, every satellite and spacecraft is a robot, but I don't think that is what you are asking. I don't think there are fully automated robots besides satellites in space. However, by 2020, the Swiss plan to send a robot into space to clean up junk, because a piece of junk the size of a ping pong ball could ruin a satellite.
Everything is attracted to everything else by gravity. So, over time, space junk will attract other space junk and join with it. This larger amount of space junk could potentially come closer and closer to Earth (as the force of gravity on it is now greater, and with a greater mass it becomes more difficult to keep it in orbit). Eventually it might crash into the Earth, conditional on not burning up in the atmosphere. The orbit of space junk could bring it in contact with, destroy and make space junk of, commuication satellites, probes, telescopes etc.
if its in orbit, then it will stay up there forever unless something hits it close enough to the Earth for it to fall.
Space junk is nonfunctional satellites, later stages of booster rockets that made it into orbit, and any thing left behind by astronauts and cosmonauts, such as gloves, nuts, bolts, garbage bags, ice and the like.
switzerland
Because satellites are blown up, forming debris, which is called space junk
something that takes up space junk
A junk removal business available to the New York area is "Remove My Junk", which will clean up debris, junk, and assisting in hoarding clean-outs and estate sales.
In a way, every satellite and spacecraft is a robot, but I don't think that is what you are asking. I don't think there are fully automated robots besides satellites in space. However, by 2020, the Swiss plan to send a robot into space to clean up junk, because a piece of junk the size of a ping pong ball could ruin a satellite.
Rocks, dust, and other space junk
Everything is attracted to everything else by gravity. So, over time, space junk will attract other space junk and join with it. This larger amount of space junk could potentially come closer and closer to Earth (as the force of gravity on it is now greater, and with a greater mass it becomes more difficult to keep it in orbit). Eventually it might crash into the Earth, conditional on not burning up in the atmosphere. The orbit of space junk could bring it in contact with, destroy and make space junk of, commuication satellites, probes, telescopes etc.
Space junk is not really a discovery. Humans put it there. We've got large quantities of junk orbiting our planet because we don't pick up after ourselves. It's not really any more of a discovery than litter is. There's no Christopher Columbus of litter, and that's basically what space junk is. So I can't really tell you who.
Put up a bunch of junk (such as dung or cheap wearables), and if you are over 13 or have sent in a parental permission form, you can put in a wishlist, and put "FREE" in the wishlist. If you mean Clean Up neopia trades, put a junk item and in the wishlist, type in "Junk Trade. Offer X junk items and I will discard them.
One of the jobs of NORAD is to track this stuff with RADAR and maintain a catalog of what is up there at all times.
junk or thing that have a lot of mass
if its in orbit, then it will stay up there forever unless something hits it close enough to the Earth for it to fall.