2005 yu(mad bro)55

[The_Worlds_finest]

http://en.wikipedia.org/wiki/2005_YU55

makes you think how on the grand scheme of things us humans tiptoe on the edge of extinction.(but then what is all this for anyway?)

[RandomGuy]

http://en.wikipedia.org/wiki/2005_YU55

makes you think how on the grand scheme of things us humans tiptoe on the edge of extinction.(but then what is all this for anyway?)

http://www.purdue.edu/impactearth

Parameters:
400m wide
Density:
1500 kg/m3 (C-Type)

Play with the impact. At worst (very high velocity) it is a very large nuclear blast, but nothing civilization ending.

I wouldn't want to be within 100km of the impact in any event. Odds are good that very few people would be, barring a hit on Beijing or Mexico City.