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Arecent Nature publication continues to generate headlines over its findings that scientists from the California Institute of Technology developed a model of a traversable wormhole on the Google Sycam...
Astronomers Confirm Asteroid KW4 is No Threat to Earth -- at Least for a Thousand Years（图）
Asteroid KW4 dynamics
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2006/12/4
November 16, 2006，The Arecibo Observatory's powerful radar -- a keen eye aimed into the sky -- has made the most detailed observations ever of a binary near-Earth asteroid. This information provides c...