Mysterious fireball explodes with the power of a small nuclear bomb above US base in Greenland puzzling NASA scientist

Mysterious fireball explodes with the power of a small nuclear bomb above US base in Greenland puzzling NASA scientist
http://strangesounds.org/2018/08/mysterious-fireball-explodes-with-the-power-of-a-small-nuclear-bomb-above-us-base-in-greenland-puzzling-nasa-scientist.html

A mysterious fireball exploding with the power of a small nuclear bomb which was detected not far from the US air base in Greenland has alerted a NASA space explorer. Another called for calm, saying it’s not a Russian strike. The curious tweet was released by Ron Baalke, a space explorer at NASA’s Jet Propulsion Laboratory, in late July. “A fireball was detected over Greenland on July 25, 2018 by US government sensors at an altitude of 43.3 km,” he wrote. The energy from the blast was estimated to be 2.1 kilotons.