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What is space junk and why does it pose an increasing risk for Earth? An expert explains

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Space junk is anything that humanity has put into low Earth orbit that hasn't fallen back to Earth or spun out into space.

As space junk degrades over time, it can slow down enough that it starts to lower out of orbit and enter the Earth 's atmosphere, accelerating its fall.

A worst-case scenario that becomes more likely year after year is what scientists call the Kessler syndrome.

Space junk that burns up as it plummets to Earth is starting to pollute the atmosphere with metals.

"I suspect we'll start to see something like official regulations about who can put stuff in space because it is limited in terms of how much you can get up there." This story is republished courtesy of Northeastern Global News news.northeastern.edu. Provided by Northeastern UniversityThis story was originally published on Phys.org . Subscribe to our newsletter for the latest sci-tech news updates..