Horizon : Asteroids - The Good The Bad And The Ugly

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For centuries asteroids have been ignored by science. The poor relation to the planets and even their icy cousins, the comets, asteroids were dismissed as boring or caricatured as the harbingers of an unlikely doom. But all that is about to change. Scientists have made some very strange discoveries that could solve one of the greatest mysteries in science - how water arrived on Earth. Recent discoveries suggest some asteroids are actually covered in ice. In fact, the status of the asteroid has changed so much that NASA has chosen the asteroid for mankind's next giant leap in interplanetary adventure. Will asteroids change the world as we know it? Horizon investigates
What Are Asteroids? (2:48)
Originating Processes (3:37)
Collision Research (7:11)
Catalina Sky Survey (2:27)
Minor Planet Centre (4:30)
Mysterious Discoveries (7:25)
Transforming the Planet (6:38)
Earthling Origins (3:23)
Small Bodies and Big Threats (3:34)
Cosmic Bombs (7:36)
Credits: Horizon: The Good The Bad And The Ugly (0:59)

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