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Satellite crash: A briefing on the 6.5-ton NASA bird falling to Earth

Satellite crash facts and fiction: How big are the risks? NASA says satellite debris could be spread across 500 miles.

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The Upper Atmosphere Research Satellite ( UARS) was deployed by the Space Shuttle Discovery (STS-48) in 1991. NASA is expecting the satellite to re-enter Earth's atmosphere in late September or early October.

NASA/Reuters

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Sometime in late September or early October, a 6.5-ton Upper Atmosphere Research Satellite, or UARS, is going to come tumbling to Earth.

Should you worry, Chicken Little?

The short answer is no.

Yes, NASA says that some pieces of its satellite will make it to Earth, while most of it will burn up upon reentry. Satellite debris could be scattered across an area 500 miles long. NASA figures that about 1,170 pounds of the 6.5-ton research bird (decommissioned 6 years ago) will get sprinkled across the planet.

Where will that 500-mile danger zone be?

Well, NASA isn't sure yet. It's too soon to tell. The rate of decay of the orbit is affected by solar flares, the gravitational pull of the Moon and the Earth, as well as gravitational anomalies. NASA says now that the satellite is likely to come down somewhere between 57 degrees north latitude and 57 degrees south. That's not a lot of help. At this point, that's a swath that covers most of the inhabited areas of the planet (from roughly Alaska and Denmark in the north to the tip of South America in the south).

But consider this from NASA's UARS update:

"Since the beginning of the Space Age in the late-1950s, there have been no confirmed reports of an injury resulting from re-entering space objects. Nor is there a record of significant property damage resulting from a satellite re-entry."

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