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A meteor caused a massive explosion over Earth last year, but nobody noticed until now. It is the second-largest recorded impact in the past century, after the meteor that exploded over the Russian region of Chelyabinsk in 2013. The giant fireball hit at 2350 GMT on 18 December over the Bering Sea, a part of the Pacific Ocean between Russia and Alaska.
...Considering the International Space Station would have easily detected or viewed the explosion.
originally posted by: wildespace
I wonder why is it a premium article. Such data should be freely available.
[Edit] Some info via Wikipedia: en.wikipedia.org...
2018, Dec 18 | over the Bering Sea | 56.9°N 172.4°E | 173 kilotonnes of TNT (720 TJ) | 25.6km | Asteroid ~10 meters in diameter. Largest airburst since Chelyabinsk.
JPL data: cneos.jpl.nasa.gov...
Hmm, why would they not know about this impact for a whole year? USA has a global monitoring system for detecting spacecraft reentry, ICBMs and nuclear tests.
The meteor was 10 metres in diameter, had a mass of 1400 tonnes and impacted with an energy of 173 kilotons of TNT, he wrote on Twitter. The impact energy was about 10 times that of the atomic bomb dropped on Hiroshima in 1945.
The explosion was detected by infrasound stations around the world, which pick up low-frequency acoustic waves inaudible to humans. These stations were initially set up during the cold war to detect nuclear explosions. It is the third-largest impact in modern times, after Chelyabinsk and a massive explosion that occurred in Siberia, Russia, in 1908.
Triangulating the location and source of an explosion requires combining pressure wave data from multiple monitoring stations, which may explain the delay in the data being made public.
The Bering Sea explosion was also picked up by US government monitors that detect fireballs: their sensors pick up electromagnetic radiation in the form of infrared and visible light.
their sensors pick up electromagnetic radiation in the form of infrared and visible light.
originally posted by: Phage
a reply to: LookingAtMars
That's talking about this, it's no so much that it was "kept quiet" just that it does take some data processing to make sense of it.