Just how devastating the impact would potentially be depends not only on the size of the asteroid, but also its composition. By comparison, the asteroid that ended the age of the dinosaur is ...

The asteroid, named 7482 (1994 PC1), is also larger ... when it's expected to come within 1.4 million miles of Earth, CBS News said. For comparison, the Moon is about 238,855 miles from Earth ...

If an asteroid this size were to collide with Earth, the scale of damage would depend greatly on where exactly it struck—and the angle of entry through the atmosphere, which affects the energy ...

April 3 (UPI) --NASA said that an asteroid previously believed to be destined for Earth is the size of a 10-story building and is now more likely to make impact with the moon. Designated as near ...