There are lots of stuff flying around the planet. Space debris. Most things will fall to earth and burn up. Some stuff will not totally burn up and hit the ground. As a planet we really do not consider stuff falling from space to be all that dangerous.
I was thinking the other day about what to do with all this junk, how to clean it up. Then it occured to me that maybe it has a defensive purpose to halt those pesky aliens from invading.
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