(NEWSER) More than 500,000 known objects are orbiting planet Earth, and around 20,000 of them are at least as big as a softball, reports NASA. Now a University College London professor has used data from space-track.orgto create a video to help us visualize how quickly that space junk has accumulated thanks to space traffic and collisions, reports Wired UK.

NASA notes that there have been few disastrous collisions, but it points to two recent ones—a Chinese missile test in 2007 and the collision of two satellites in 2009—that threw 5,000 items of debris into orbit.

Video: YouTube

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