[CBS News] A newfound asteroid gave Earth a close shave early today, zipping between our planet and the moon just two days after astronomers first spotted it.The near-Earth asteroid 2012 XE54, which was discovered Sunday (Dec. 9), came within 140,000 miles of our planet at about 5 a.m. EST Tuesday (Dec. 11), researchers said. For comparison, the moon orbits Earth at an average distance of 240,000 miles or so.
Astronomers estimate that 2012 XE54 is about 120 feet wide -- big enough to cause substantial damage if it slams into Earth someday. An object of similar size flattened 800 square miles of forest when it went
kaboom!above Siberia's Podkamennaya Tunguska River in 1908.
Asteroid 2012 XE54 also passed through Earth's shadow a few hours before its closest approach, generating an eclipse on the space rock's surface, researchers said.