fyoder's Journal: Tunguska More Woosh than Boom

The Tunguska event in which an asteroid air detonated over Siberia is approaching its 100th anniversary, which will be on June 30th. A lower re-estimation of the blast force (the devastation being more from the shock wave of the air blast than the explosion itself) suggests that asteroid events capable of this level of destruction may be more common than thought, possibly occurring every few centuries. Reflecting on these 'little guys' as the anniversary approaches, also causes one to consider their rarer, but more destructive, larger cousins. Should it not be a priority to establish a self-sustaining breeding population of humans on Mars as insurance against something really nasty happening here on earth?

Collision Course Earth