Asteroids have struck Earth occasionally over its long history, often with cataclysmic results. An asteroid estimated at 6-9 miles (10-15 km) wide hit off the coast of Mexico's Yucatan Peninsula 66 ...

Imagine that the Earth was hit by an asteroid the size of the World Trade Center. What would happen? Scientists have modeled ...

YR4 has just above a 1% chance of crashing into Earth in 2032, which is why astronomers and space agencies are paying attention to it.