Meteor that blasted millions of trees in Siberia only 'grazed' Earth, new research says

May 26, 2020
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If the blast pattern was radial, then how could this meteor be extremely fast and skimming our atmosphere but not leave an oval pattern?

Also many iron meteorites DO break apart, but size does matter, right?
 
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CO2 is carbon dioxide. How could that have made a fireball and lit up the sky for several miles?
From my understanding, it's the force of the impact with the atmosphere that can create a fireball and shockwave. The comet may have been mixed with heavier elements as well. I've heard them described as "dirty snowballs".