By Lara Heintz http://motherboard.tv/2011/9/23/the-sky-is-falling-space-junk-s-gre...
The Tunguska Event
Though it flattened all the trees in every direction for 30 miles, the airburst that took place over Siberia's Tunguska River left no crater behind. Scientists theorize that the blast, caused probably by a meteor or comet fragment that exploded a few miles over the surface of the Earth, was 1000 times as powerful as the bomb that fell on Hiroshima, Japan.
Impact Crater
Gosses Bluff, near Alice Springs, Australia was formed by the impact of a meteor or comet about 143 million years ago. It is one of the approximately 170 terrestrial impact craters on the Earth's surface.
Alarmist as it all sounds, 500,000 documented hunks of cosmic junk to date float around Earth. Space programs since the Cold War have had to deal with fallout. Mostly this stuff just stays in orbit, but every once in awhile bits of space crud collide—into one another or, occasionally, us.
Hole in the Desert
Much smaller and younger than Gosses Bluff, Arizona's Meteor Crater is also known as Barringer Crater, in honor of Daniel Barringer, the man who first suggested it was formed by the collision of a meteor with the Arizona desert around 50,000 years ago
Read more: http://www.time.com/time/photogallery/0,29307,1818757,00.html#ixzz1...
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