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Do Big Stars Spawn Giant Black Holes?

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Galaxy NGC-1097 with black hole at center
NASA / AP
Scientists thought that the universe's biggest black holes were formed by smaller holes joining together. But a University of Colorado astrophysicist has come up with a new idea: The holes are actually born in mammoth stars that are tens of millions of times the mass of our sun.
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Commercial Spaceship Makes Debut

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SpaceShipTwo
AFP/Getty images
British billionaire Sir Richard Branson unveils a spacecraft for commercial passengers. If SpaceShipTwo passes a battery of safety tests, it might carry wealthy tourists into orbit as soon as 2011. Branson says he hopes to send "literally thousands of people" into space over the next few years.
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10 Surprising Effects of Climate Change

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Woman sneezing
Getty Images
Allergy seasons are coming earlier. Arctic lakes are vanishing by the dozen. And the world's mountains are springing a little higher. These trends are just a few of the more surprising effects of global warming.
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Mammoth Fossil Site Opens to Public

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Texas Oysters Linked to Contagious Virus

The Food and Drug Administration is urging consumers not to eat oysters from San Antonio Bay in Texas, saying they've been linked to a highly contagious virus that causes stomach flu.
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Sphere

US: Greenhouse Gases Are Hazardous

As an international climate conference opens in Copenhagen, the United States says greenhouse gases blamed for global warming should be regulated as a health hazard. The announcement comes as delegates from 192 nations call on leaders to take stronger action to save the Earth.
Sphere: Most Americans Want Action on Climate Change
Opinion: 5 Myths | Why Copenhagen Matters | Pain, No Gain
The Point: Copenhagen by the Numbers
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