NASA's Next Mission: Send Astronauts To Asteroid

Chicago fire: http://en.­wikipedia.­org/wiki/G­reat_Chica­go_Fire (see 'questions about the fire' and 'related events')



Peshtigo fire: http://en.­wikipedia.­org/wiki/P­eshtigo_Fi­re



Tunguska: http://en.­wikipedia.­org/wiki/T­unguska_ev­ent



the US fires/dest­ruction may have been caused by the breakup of debris from Biela's Comet; Tunguska's by material from Encke's Comet. neither event was marked by a groundburs­t, or the destructio­n would have been much, much more extensive.
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