The six-mile-wide asteroid punched a one-way ticket toward extinction for all non-avian dinosaurs. Some 66 million years ...

The amount of light reflected by the asteroid’s surface is used to estimate how big it is. However, the Webb telescope, slated to begin observations of 2024 YR4 in early March, sees the universe in ...

YR4 has a roughly 2 percent chance of hitting Earth in 2032, and “is large enough to cause localized damage,” NASA says.

YR4 has a 2.3% chance of hitting Earth in the year 2032. But according to new estimates, it may have an even smaller chance of hitting the moon instead.

The asteroid is estimated to be about 40-90 meters wide, big enough to cause local devastation but not mass extinction. While the asteroid is dangerous enough to merit attention from scientists ...