Chicago Fire

Did Mrs. O’Leary’s cow spark the Great Chicago Fire of 1871? Retired McDonnell Douglas physicist Richard Wood says “no”:

New research lends credence to an alternative explanation: The fire, along with less-publicized and even more deadly blazes the same night in upstate Wisconsin and Michigan, was the result of a comet fragment crashing into Earth’s atmosphere.
. . .
The likely suspect, in Wood’s eyes, is a fragment from Biela’s Comet, which had been circling the sun every six years and nine months before a close encounter with Jupiter caused it to break into two large fragments in 1845. During its next passage, astronomers noted a 1.5-million mile, 15-day gap between the two pieces.
Wood said his analysis of the fragments’ positions during subsequent orbits shows that Jupiter’s gravity again affected their speed and trajectory, sending the smaller fragment on a path toward Earth that ended in October 1871. He presented his findings at a conference last week titled “Planetary Defense: Protecting Earth from Asteroids,” held in Garden Grove, Calif.
Wood cited eyewitness reports of spontaneous ignitions, lack of smoke and “fire balloons” falling from the sky to bolster his theory. If the fire had been caused by comet debris, which is believed to have consisted of small pieces of frozen methane, acetylene or other highly combustible chemicals, it also would explain the cause of the fires blazing north of Chicago, which wiped out 2,000 people and burned 4 million acres of farm and prairie lands.

Is this the answer? It bets me. But this explanation doesn’t sound a whole lot less plausible than a cow.