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Asteroid takes Earth by surprise

MSNBC reports that the newly discovered asteroid 2002 EM7 spends much of its time inside Earth's orbit during its 321-day...

MSNBC reports that the newly discovered asteroid 2002 EM7 spends much of its time inside Earth’s orbit during its 321-day circuit around the sun and On March 8, the asteroid came almost as close to Earth as the moon. Our scientists knew it was that close only after it went away.