Comet Rained

South African scientists will this week present evidence of a comet that struck Earth, heating the sands of the Sahara desert to 2,000 degrees Celsius (3,632 degrees Fahrenheit) and forming the silica glass found in Egyptian King Tutankhamun’s scarab broach.

“Evidence of a comet entering Earth’s atmosphere and exploding, raining down a shock wave of fire, which obliterated every life form in its path,” Johannesburg’s University of the Witwatersrand says in an e-mailed statement today. “The comet entered Earth’s atmosphere above Egypt 28 million years ago.”

http://www.bloomberg.com/news/2013-10-08/comet-rained-shock-wave-of-fire-on-sahara-desert.html