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http://science.nbcnews.com/_news/2013/02/22/17058890-fireballs-flying-in-formation-clues-to-100-year-old-mystery-found
It may be the ultimate cosmic cold case, but the 100-year-old mystery of a huge group of fireballs flying in formation through Earth's atmosphere is finally a bit closer to being solved, scientists say.
By sifting through the archival records from the meteor procession that took place on Feb. 9, 1913, sleuthing stargazers pieced together the surprisingly large path of the rare astronomical event.
From Canada to Brazil, observers watched as hundreds of meteors streaked across the sky, but this wasn't any ordinary annual meteor shower. Because these meteors were traveling nearly parallel to the surface of the Earth, each piece of space dust and rock stayed visible for about a minute as each burned up in Earth's atmosphere. The procession lasted for several minutes.
"To most observers, the outstanding feature of the phenomenon was the slow, majestic motion of the bodies; and almost equally remarkable was the perfect formation which they retained," said Clarence Chant, a University of Toronto astronomer who observed the procession in 1913.
But 100 years later, scientists were still missing a piece of the astronomical puzzle. No one knew exactly how wide-reaching the meteor procession was.