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http://www.washingtonpost.com/national/health-science/nasa-satellit...


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The sky is not falling. A 12,500-pound NASA satellite the size of a school bus is, however.

It’s the Upper Atmosphere Research Satellite, or UARS — YOU-arz — and it’s currently tumbling in orbit and succumbing to Earth’s gravity. It will crash to the surface Friday.

Or maybe Thursday. Or Saturday.

Out-of-control crashing satellites don’t lend themselves to exact estimates even for the precision-minded folks at NASA. The uncertainty about the “when” makes the “where” all the trickier, because a small change in the timing of the reentry translates into thousands of miles of difference in the crash site.

As of the moment, NASA says the 35-foot-long satellite will crash somewhere between 57 degrees north latitude and 57 degrees south latitude — a projected crash zone that covers most of the planet, and particularly the inhabited parts. In this hemisphere, that includes everyone living between northern Newfoundland and the frigid ocean beyond the last point of land in South America.

Polar bears and Antarctic scientists are safe.

It’s the biggest piece of NASA space junk to fall to Earth in more than 30 years. It should create a light show. The satellite will partially burn up during reentry and, by NASA’s calculation, break into about 100 pieces, creating fireballs that should be visible even in daytime.

An estimated 26 of those pieces will survive the re-entry burn and will spray themselves in a linear debris field 500 miles long. The largest chunk should weigh about 300 pounds.

As the Friday-ish crash gets closer, NASA will refine its estimate of timing and location, but the fudge factor will remain high.

“There are too many variations on solar activity which affect the atmosphere, the drag on the vehicle,” said Nicholas Johnson, chief scientist for orbital debris at NASA. He said that when NASA estimates that the satellite is two hours away from hitting Earth, there will still be a margin of error of 25 minutes.

“That equates to plus or minus 5,000 miles. That’s a lot of real estate,” he said.

 

The good news is that UARS will probably splatter into the open ocean, because Earth is a water planet. And humans, for all their sprawl, occupy a very limited portion of its surface.

NASA did a calculation of the odds that someone would be struck by UARS debris. It’s very unlikely: about a 1-in-3,200 chance that one person somewhere in the world would be hit. That’s not the odds for any specific person (say, a reader of this story), but for the entire human population, which is about 7 billion.

Used fuel tanks and rocket bodies fall to Earth frequently, Johnson said, “and in over 50 years of these things coming back around the world, no one has ever been hurt. There has never been any significant property damage.”

The satellite was launched on the space shuttle Discovery in 1991 and spent 14 years studying the atmosphere as part of an effort to understand, among other things, the human influence on climate change. It measured chemicals that damage the ozone layer, aerosols from Mount Pinatubo and changes in solar radiation that affect the upper atmosphere. But NASA decided in 2005 that UARS’s work had become redundant to that performed by other satellites, and it received its scientific pink slip.

 

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HAHAH or Maybe it is a weather balloon? .. Excited to hear all your thoughts!!!!

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Well thats not very reassuring... at this point it could land anywhere on earth between a 3 day period. i guess we will have to wait until its 2 hours away from hitting earth to find out a more precise crash zone. LOL weather balloon yeah maybe.. It would be cool though to see a nice fireball show on its way down. :)

my thoughts is.. is it a cover up for something they know to be entering our atmosphere on friday?  and if so.. what is that something.. is it really a sat or something more?

 

could be a cover for elenin if seen?

 

Tho im gonna make sure to 'look up this week!

Oke on friday,  the fireworks begin!!??!!   so for now I can go to sleep  and you are sure that there isn't  gonna fall a satelite on me??? Hahahahahahahaha Nighty night sweet friends ;)
take photos and videos yeah

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