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(Phys.org)—New research by Stanford aeronautics and astronautics Assistant Professor Sigrid Close suggests she's on track to solve a mystery that has long bedeviled space exploration: Why do satellites fail?
In the popular imagination, satellites are imperiled by impacts from "space junk" – particles of man-made debris the size of a pea (or greater) that litter the Earth's upper atmosphere – or by large meteoroids like the one that recently exploded spectacularly over Chelyabinsk, Russia.
Although such impacts are a serious concern, most satellites that have died in space haven't been knocked out by them.
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Something else has killed them.
The likely culprit, it turns out, is material so tiny its nickname is "space dust."
These natural micro-meteoroids are not directly causing satellites harm. When they hit an object in space, however, they are traveling so fast that they turn into a quasi-neutral gas of ions and electrons known as plasma.
That plasma, Close theorizes, has the