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In this animated sequence of photos taken by Japan’s Himawari 8 weather satellite on Dec. 18, 2018, you can follow the progress of the dark streak — a combination of the shadow left by the meteoroid’s plume (orange patch to the right) and dust stripped from the object as it came crashing down into Earth’s atmosphere at an estimated 32 km/s (72,000 mph). Japan Meteorological Agency

Last December 18th at 11:48 a.m. local time, a meteoroid exploded with 10 times the force of the Hiroshima atomic bomb over the Bering Sea. It became the second most powerful meteor blast this century, after the Chelyabinsk explosion in 2013 that released the energy equivalent of 20 to 30 atomic bombs.

These are the individual images taken 10 minutes apart by the Himawari 8 satellite showing the evolution of the plume and shadow. Japan Meteorological Agency

https://www.jma.go.jp/jma/indexe.html

https://en.wikipedia.org/wiki/Chelyabinsk_meteor

In this frame taken by NASA’s Terra satellite, the dense plume of ablated dust billows in the aftermath of the fireball. A more diffuse trail of dust seems to extend from the main plume toward and into the shadow. Rocked by its high-speed impact with the atmosphere, the meteoroid exploded about 26 kilometers above Earth’s surface. NASA/GSFC/LaRC/JPL-Caltech, MISR Team

 

 

This is an earlier Terra image showing the plume and the shadow which appears reddened. Could this reddening be caused in part from meteoric dust hovering above the shadow? NASA/GSFC/LaRC/JPL-Caltech, MISR Team

 

Fireballs and their magnitude as reported by U.S. government sensors. Alex Chamberlin / JPL-Caltech

Fireball explosion over Pinar del Rio, Cuba, on February 1st. You can hear the explosion at the 55-second mark.

Astronomers have discovered more than 90% of near-Earth asteroids larger than a kilometer across — the ones that would have serious consequences in the event of a strike. But little ones, like Chelyabinsk or Tunguska? Nearly all are unannounced simply because they’re so tiny, they escape our notice. Fortunately, the atmosphere serves as an excellent defense against objects up to several tens of meters.

Amazing Images Capture Giant Fireball Exploding Over the Bering Sea