Comments approved out by the Wide Field Infrared
Explorer to Survey (Wide-field Infrared Survey Explorer, or WISE, for its
acronym), NASA, have yielded the best on record count Today the population of
potentially hazardous asteroids in our solar system. Also known as
"PHAs" (acronym for Potentially Hazardous English Asteroids), these
asteroids have orbits within about eight million kilometers (five million
miles) from Earth's orbit and are large enough to survive passing through the
Earth's atmosphere and cause damage on a regional,
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Saturday, June 23, 2012
Friday, June 22, 2012
A cosmic collision might fade away the water

From the center of the galaxy Ghost beams of gamma rays rising
The center of the Milky Way shows little activity in contrast. It was not always so peaceful. New evidence of ghost beams of gamma rays suggests that the central black hole of our galaxy was much more active in the past.
"These jets are
faint ghost or just a sequel to what existed for millions of years," said
Meng Su, an astronomer at the Harvard-Smithsonian Center for Astrophysics
(CfA), and author of a new article in the Astrophysical Journal. "But it
reinforces the evidence that there was an active galactic nucleus in the
relatively recent past of the Milky Way," he added.
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