Earth's close encounter with an asteroid
Meg Urry, Special to CNN
Updated 8:03 AM EST,
Tue November 8, 2011
A giant asteroid, Vesta, is seen in an image taken from the NASA Dawn spacecraft July 24, 2011.
STORY HIGHLIGHTS
A midsized asteroid will pass by Earth on Tuesday
Meg Urry: No need to worry about this one, but risk of asteroid collision is real
She says asteroids have collided with Earth and moon, sometimes disastrously
Urry: Next few days will provide a gold mine of information for scientists
link-
http://www.cnn.com/2011/11/08/opinion/urry-asteroid-earth-risk/index.html?hpt=hp_t2