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Asteroids: Close and Closer, but Not Too Close for Comfort

Herschel space telescope spots asteroid Apophis

Early this morning, while most of the U.S. slept, a once-menacing asteroid drew close to Earth on its usual rounds through the inner solar system. The 300-meter asteroid, known as Apophis, kept a comfortable distance, flying well beyond the orbit of the moon. But Apophis has not drawn so near to Earth since 2004, when [...]

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