Dec 12, 2012 1:17 AM by Mike Wall, NBC
UNDATED - A giant asteroid will make a flyby of Earth over the next few days, and armchair astronomers can watch the action live on their computers.
The near-Earth asteroid 4179 Toutatis, which is about 3 miles (5 kilometers) wide, will zoom within 4.3 million miles (7 million kilometers) of Earth during its closest approach early Wednesday morning. That's too far away to pose any impact threat on this pass, but close enough to put on a pretty good show through top-notch telescopes, researchers say.
Asteroid Toutatis was first viewed in 1934, then officially discovered in 1989. It makes one trip around the sun every four years.
The Minor Planet Center in Cambridge, Mass., lists Toutatis as a potentially hazardous object, meaning that it could pose a threat to our planet at some point in the future. The current flyby is no cause for concern, however. At its closest approach, which comes at 1:40 a.m. ET W Wednesday, Toutatis will still be 18 times farther away from Earth than the moon is.
Toutatis would cause catastrophic damage if it ever did slam into Earth. In general, scientists think a strike by anything at least 0.6 miles (1 km) wide could have global consequences, most likely by altering the world's climate for many years to come.
For comparison, the asteroid thought to have wiped out the dinosaurs 65 million years ago was an estimated 6 miles (10 km) across.