The largest asteroid ever to hit Earth, which slammed into the planet around 2 billion years ago, may have been even more massive than scientists previously thought.

The asteroid 1989 JA is more than a mile long and is twice the size of the tallest building in the world. But no need to fear: It won't hit us.

NASA is monitoring an asteroid called Bennu which has a 1/2700 chance of impacting Earth between 2175 and 2195. But as that is a long time off, here are the top five biggest asteroids. 1.

Around 2 billion years ago, an asteroid the size of Mount Everest, or possibly even larger, struck Earth with catastrophic ...

A mile-wide asteroid called 1989 JA passed safely by Earth in May, and NASA collected observations of the space rock using the Goldstone Deep Space Communications Complex.

It was created by a 7.5-mile-wide (12 km) asteroid that hit Earth 66 million years ago. Though the crater is now partially on land, at the time of impact the Yucatan was under a shallow sea.

It won’t be the largest asteroid to ever sweep past Earth. That honor belongs to the asteroid 3122 Florence (1981 ET3), which flew by and missed colliding with Earth on September 1, 2017.