Huge UARS Satellite's Fall From Space Captivates Skywatchers, Sparks Hoaxes

Skywatchers around the world were hoping for some unique views overnight Friday (Sept. 23), as a NASA satellite plunged to Earth on its final scorching journey through the atmosphere.

The 6.5-ton Upper Atmosphere Research Satellite, or UARS, most likely pierced through Earth's atmospheric shield within 20 minutes of 12:16 a.m. EDT Saturday (0416 GMT), according to NASA officials. The agency is unable to confirm the precise time and location of the satellite's re-entry, but orbital debris scientists said that the satellite would have been flying over the vast Pacific Ocean at the time, well away from the North American coastline.

Throughout the night, rumors circulated that the defunct satellite crashed over Alberta, Canada, raining debris on the small town of Okotoks, which lies south of Calgary. Local authorities who were called to investigate later called the claims a hoax. [6 Biggest Spacecraft to Fall Uncontrolled From Space]

Read more

Landing of Dead NASA Satellite 'Too Early to Predict': NASA

A dead 6.5 ton NASA UARS satellite would make its re-entry into Earth's atmosphere on Friday, Sept. 23, bringing along a chance to watch a spectacular sky show. But NASA is still not sure where on Earth the satellite would land.

"It is still too early to predict the time and location of re-entry with any more certainty, but predictions will become more refined in the next 24 to 48 hours," National Aeronautics and Space Administration (NASA) said in a statement.

NASA added that the debris from the defunct satellite would not cause harm to humans.

NASA conducted a detailed re-entry risk assessment for UARS in 2002 and it showed that the debris from UARS is not harmful to human beings. Following are the excerpts of the study:

* Number of potentially hazardous objects expected to survive: 26

* Total mass of objects expected to survive: 532 kg

* Estimated human casualty risk (updated to 2011): About 1 in 3200

Read more