Meteor That Exploded With Force of 10 Hiroshima Bombs Went Unnoticed

This Bright Leonid Fireball Is Shown During The Storm Of 1966 In The Sky Above Wrightwood, Calif. Nasa/Getty Images

Hurtling towards the earth 30 times faster than a rifle bullet, a 1,400-ton fireball exploded with the energy of 10 Hiroshima bombs in a blinding flash on the night of Dec 18, 2018, becoming the third largest meteor impact in modern times.

However, the explosion, 15.5 miles above the remote Bering sea, had no witnesses and was picked up only on NASA instruments, which had held onto their secret until now.