Who do you want to see receive $20,000 to put their Earth-saving idea into action? Check out the ten Green Effect finalists, and until July 20 you can vote—up to once a day—for your favorite idea!
Friday, July 10, 2009 |
Friday, July 10, 2009 |
Photo: Most Massive Stellar Black Hole Found in Binary SystemAt roughly 16 times the mass of the sun, the black hole is the most massive known to have formed from the collapse of a star's core, astronomers recently announced. Its companion star is about 70 times the mass of the sun, making it the most massive star in a binary system containing a black hole. Image courtesy NASA/CXC/M. Weiss
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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