NASA Satellite UARS is close to dead to make his plunge into Earth’s atmosphere, but still do not know where to land.

UARS is scheduled for Friday to come out of orbit, more or less a day, as determined by NASA scientists.

NASA scientist Mark Matney said UARS likely to de-orbit on Friday morning. “Right now, UARS has really come a little ‘sooner than expected, because the activity of the sun has risen, which accelerates the return,” he said.

This is the largest NASA satellites to Earth because of uncontrolled Skylab in 1979. UARS weighs about 6 tons, and the school bus, but most of the way back up again. What it takes to survive a return to the concerns of NASA.

Nicholas Johnson, chief scientist in NASA’s orbital debris, said that their analysis shows that 26 parts of the UARS survive. “Those 26 components, which we hope to clear all the way down, go at a reasonable rate of tens to hundreds of miles an hour,” he said. “All these 26 were identified as potentially cause damage if they hit a structure or a person, but the odds are very, very low”.

Johnson said the chances of someone being hit by debris are small – something that is 21000000000000. Opportunities that are 7 billion people on Earth, one of them, somewhere, might be a success – the odds are greater than 1 in 3200

About 150 tons of meteorites, in pieces, large and small, landed on the planet every day. Some are visible, such as meteors spotted in California last week, but most of the remains are so small, it is never found.

What makes it so remarkable is its size and UARS notice to NASA officials that is coming. Due to the different densities of the upper atmosphere, it will not be able to tell where it will fall to two hours before it plunges to Earth.

Johnson said of the potential target range is wide. “This is a fairly large area, 57 degrees north to 57 degrees south,” he said.

This “essentially covers the entire populated world. I think there is a small percentage living above and below latitudes, but the vast majority of 7 billion people on earth live in these latitudes, “he said.

This means that any person quite well south of the northern Arctic and Antarctica. Johnson said the sun to blame for the mystery. “The sun is constantly changing to energy production, affecting the atmosphere, and can accelerate from behind the back of the satellite,” he said.

UARS (upper atmosphere research satellite) launched the space shuttle Discovery in 1991. NASA’s UARS was the first multi-satellite instruments to study the chemistry of the earth, and to measure the amount of light from the sun UV radiation and visible wavelengths. UARS ceased to be profitable in 2005.

UARS When launched, orbiting the planet at an altitude of 350 miles. That is now 140 miles, and continue losing altitude until there is enough air around it to stop at orbital velocities.

US Space Command Vandenberg AFB will detect resistance syndrome of the upper airway when he returns, and NASA will send regular updates.

The asteroid is believed to have led to the extinction of the dinosaurs may have been the culprit, according to the American space agency NASA.

Although scientists are not sure of a large asteroid collides with Earth 65 million years ago, now seems likely the original suspect, a Baptist, an asteroid, was not the culprit, U.S. News editor Sally Arthy explains.

The study of the NASA Infrared Survey Explorer Wide field, seemed to close the Baptist.

WISE surveyed the entire celestial sky on two occasions in the infrared from January 2010 to February 2011.

The infrared light to estimate the size of the asteroid more accurately than visible light.

Scientists have established that the asteroid rotates around Baptistina really 80 million years, half the time originally planned.

This result means that the rest had only 15 million years to get thrown to the ground to cause the extinction of dinosaurs.

NASA scientist Amy Mainzer said: “This process is normally supposed millions of years.”

Another expert from NASA, Lindley Johnson, said: “Due to the investigation of the scientific team of WISE, the closure of dinosaurs in Cold Case Files.

“Initial calculations with the estimated size of the visible light and the reflectivity of a Baptist family, who estimates his age, but now we know that these estimates were off.

“Thanks to infrared light, WISE has been able to get a more accurate estimate, giving the time of Baptistina theory in question.”

Thus, the family has produced an asteroid dinosaur-killing is still a large residual.

The evidence that an asteroid hit Earth 10 km 65 million years ago has a huge crater-shaped structure in the Gulf of Mexico and the rare minerals in the fossil record, which are common in meteorites, but are rarely found in Earth’s crust.