Ranked #1
Meteor Craters
Meteor Craters
Transcript: When we look at the Moon we are looking in a mirror. The Moon has lived for the same length of time as the ... Read more
21 Jul 2011
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1min
Ranked #2
Tunguska
Tunguska
Transcript: On June 30, 1908, an explosion occurred in the skies above Siberia. Reindeer herdsmen were flung into the a... Read more
21 Jul 2011
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Ranked #3
Impacts From Space
Impacts From Space
Transcript: The destructive power of meteorites can be illustrated by considering a few examples of different sizes. A ... Read more
21 Jul 2011
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1min
Ranked #4
Impact Rate of Meteorites
Impact Rate of Meteorites
Transcript: Interplanetary debris is a negligible component of the mass of the entire solar system, most of which reside... Read more
21 Jul 2011
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1min
Ranked #5
Meteorite Collisions
Meteorite Collisions
Transcript: The odds of being hit by a meteorite are incredibly small. In pre-history we don't know what happened, but ... Read more
21 Jul 2011
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1min
Ranked #6
Origin of Meteorites
Origin of Meteorites
Transcript: Stony and carbonaceous meteorites are the most primitive kind because they form unmelted material that gives... Read more
21 Jul 2011
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Ranked #7
Types of Meteorites
Types of Meteorites
Transcript: Meteorites come in three basic types: stony, metallic, and carbonaceous. These types mirror the basic types... Read more
21 Jul 2011
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1min
Ranked #8
Meteorites in History
Meteorites in History
Transcript: Objects that fall from the sky have long been a source of awe and wonder. The Winona stony meteorite was bu... Read more
21 Jul 2011
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Ranked #9
Meteorites
Meteorites
Transcript: When a rocky or metallic interplanetary body hits the Earth we call it a meteorite. Meteorites are free sam... Read more
21 Jul 2011
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Ranked #10
Evolution of Asteroids
Evolution of Asteroids
Transcript: The composition of asteroids tells us about their history over the age of the solar system. The fact that c... Read more
21 Jul 2011
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