New calculations at Harvard-Smithsonian Center for Astrophysics suggest that hundreds of massive black holes, left over from the galaxy-building days of the early universe, may wander the Milky Way and will start swallowing what ever comes in their way. Fortunately Earth is safe. The closest rogue black hole should reside thousands of light-years away. Astronomers are eager to locate them, though, for the clues they will provide to the formation of the Milky Way.
Hundreds of rogue black holes should be traveling the Milky Way's outskirts, each containing the mass of 1,000 to 100,000 suns. They would be difficult to spot on their own because a black hole is visible only when it is swallowing, or accreting, matter.
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Saturday, May 2, 2009
Space debris around is increasing
The space around Earth is becoming more cluttered by the day with orbital junk that, if left unchecked, will pose an ever-increasing threat to current and future spacecraft, a panel of experts says.
The Department of Defense's Space Surveillance Network, which relies on a global network of monitoring stations, is currently tracking more than 19,000 objects in Earth orbit larger than four inches (10 cm), but there are an estimated 300,000 total objects bigger than a half-inch (1 cm) in size circling Earth. In 1980, the network was tracking just 4,700 objects, about 2,600 of which were space trash.
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The Department of Defense's Space Surveillance Network, which relies on a global network of monitoring stations, is currently tracking more than 19,000 objects in Earth orbit larger than four inches (10 cm), but there are an estimated 300,000 total objects bigger than a half-inch (1 cm) in size circling Earth. In 1980, the network was tracking just 4,700 objects, about 2,600 of which were space trash.
For more details please Click here.
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