A huge defunct satellite is soon to come crashing down to the Earth in a few days time, but NASA assures everyone that no one will get hurt! The satellite in question is the Upper Atmospheric Research Satellite (UARS). The date for the crash is 24th September. The crash window, earlier announced to be between late September and early October, has now been curtailed to just three days.
What Are Your Odds Of Being Hit? And Something About a Light Show! http://techie-buzz.com/science/nasa-falling-satellite-chances.html
UPDATE: Yeah, we were exactly right. Crash happened at midnight of 23rd September. Check it out: http://techie-buzz.com/science/android-app-falling-satellite.html (Updated Article)
Any Danger? Nope, says NASA
Space junk experts ruled that the chance of a piece of debris from the giant satellite hitting someone on the ground is extremely remote – about 1 in 3200. The logic is simple 75% of the Earth is covered by oceans and, thus, a drop into the ocean is the most likely scenario.
NASA expects the 5-ton UARS to break up into at least 26 fragments that will be big enough to survive the re-entry and reach the surface of the Earth. These fragments are mainly scrap metal and there is no need to worry about toxic materials. The fuel was used up in 2005, when the UARS completed its mission.
UARS was launched in 1991 to measure ozone content in the atmosphere along with other gases. It also measured wind speeds and studied how radiation and charged particles from the sun affect the upper part of the atmosphere. This mission was completed in 2005. Since then, it has been orbiting Earth, being nothing more than just a big piece of space junk.
NASA’s official UARS Page: http://www.nasa.gov/mission_pages/uars/index.html
The satellite is losing altitude, even as you read this. Currently it is at about 140 miles above the Earth’s surface. It is in fact falling faster than expected owing to the increased solar activity, which tends to lower the density of the atmosphere by heating it up.
According to NASA,
Re-entry is expected Sept. 23, plus or minus a day. The re-entry of UARS is advancing because of a sharp increase in solar activity since the beginning of this week.
No one knows where the satellite will fall. That will be known only two hours before the re-entry.
The crash is expected to occur between the latitudes of Northern Canada (about 62 degrees North) and south of South America (about 60 degrees South). This leaves a large region of ocean for the spacecraft to splash into. NASA is monitoring the satellite’s every move.
NASA has warned the public not to touch any debris that they might chance across, either on land or in the water. Anyone chancing upon such a piece should contact their local law enforcement agency.