Trying to clear my mind of such distressful thoughts as Feinstein in an Alien Amazon costume I went to read about flying rocks that can fuck up the world
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And I found an expert claiming that the rock that caused the explosion seen in 6 Argentinian northern provinces, probably was about 20 cm diameter, but is traveling to 130.000 km/h (80778 mph) when it ingress to the atmosphere.
If that was a 20 cm object... I wouldn't like to know what would a 20 meters object do, scary shit man.