Tunguska Explosion of 1908 Caused by Asteroid Grazing the Earth?

A new theory by Russian scientists argues that the Tunguska explosion of 1908 was caused not by a disintegrating comet or by the explosion of a small black hole (as has been traditionally theorized), but by an iron asteroid passing into and then out of the Earth’s atmosphere–like a through-and-through gunshot wound.

This theory fits many of the characteristic facts of the Tunguska explosion: eyewitness accounts of the sky “split in two,” a huge explosion, widespread fire, millions of trees flattened but no visible crater, and reports of dust in the upper atmosphere over Europe after the event.

If true, it would mean that an iron asteroid the size of a football stadium narrowly missed striking the Earth…and ending civilization.

Better to be lucky than good, I suppose?