Inscrit le: 07 Oct 2017
|Posté le: Sam 2 Déc - 07:29 (2017) Sujet du message: The growing problem of space debris
The September uncontrolled reentry of NASA’s UARS satellite places a spotlight on a problem that has been building for decades, the problem of debris in orbit around Earth.
The bus-sized Upper Atmosphere Research Satellite (UARS) satellite plunged to Earth over the Pacific, apparently causing no damage or injuries.
Less publicized was another space debris incident – called a “scare” by some – that took place on June, when orbital debris came within a couple of hundred yards of the International Space Station (ISS).
According to a post by Richard Ingham at Phys.org, millions of chunks of metal, plastic and glass are moving in orbit around Earth. These bits and pieces of space debris – plus many intact orbiting satellies – are left from 4,600 launches in 54 years of space exploration, Ingham said.
He points out that the collision risk is clearly low, since collisions between major satellites and debris to not happen often. But space junk travels at high speeds in orbit. Even a small piece can cripple an orbiting satellite that make have cost tens of millions to launch.
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