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Comet Implicated in Tunguska Blast
Latest research has concluded that the Tunguska explosion was almost certainly caused by a comet entering the Earth’s atmosphere. And how researcher Michael Kelly from Cornell University came to that conclusion is quite interesting: He analyzed the space shuttle's exhaust plume and noctilucent clouds.
New Blow for Dinosaur-Killing Asteroid Theory
The enduringly popular theory that the Chicxulub crater holds the clue to the demise of the dinosaurs, along with some 65 percent of all species 65 million years ago, is challenged in a paper to be published in the Journal of the Geological Society on April 27, 2009.
Was the Tunguska Fireball a Comet Chemical Bomb?
Over a century ago, on June 30th, 1908 a huge explosion detonated over an unpopulated region of Russia called Tunguska.
Astronomy: The rock that fell to Earth
When an asteroid was spotted heading towards our planet last October, researchers rushed to document a cosmic impact from start to finish for the first time.
- It's possible to download this article as PDF - comets77 on 2009-03-27
YouTube - A visit to the site of the Tunguska explosion
New Scientist features editor David Cohen narrates his journey to the site of the Tunguska explosion in Siberia.
NASA - The Impact and Recovery of Asteroid 2008 TC3
The Impact and Recovery of Asteroid 2008 TC3.\nNASA detects and tracks asteroids and comets passing close to Earth. The Near-Earth Object Observation Program, commonly called "Spaceguard," discovers, characterizes and computes trajectories for these objects to determine if any could be potentially hazardous to our planet. \n\n
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