A 460-foot-long asteroid, discovered a week ago, passed the Earth this weekend at a distance of about 600,000 miles, scientists say. Asteroid 2013 ET was about eight times larger than the one that exploded over Russia in February and was among a few space rocks to pass by this weekend. Astronomers warn that many others will likely follow suit. "We're not sitting here on our pale, blue dot on our own in nice safety. ... This should be a wakeup call to governments," said Paul Cox, a telescope engineer.
Published in Brief: