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NOTE: This gallery was originally posted on June 28, 2011 and was updated on Nov. 8, 2011
NASA warns that an asteroid named 2005 YU55 which is about the size of an aircraft carrier will safely fly past the Earth, closer than the moon's orbit. The closest the asteroid is expected to approach the Earth is 201,700 miles or 0.85 the distance to the moon. This is expected to occur at 3:28 p.m. PST on Nov. 8.
The last time an asteroid flew this close to Earth was in 1976 - although it went unnoticed at the time. The next close encounter with an asteroid this size is expected in 2028.
This image of 2005YU was taken on Nov. 7 about 860,000 miles from Earth.
This map shows the 2005YU's nearest approch to Earth.