Big asteroids heading towards the earth

By Grant Jacobs 15/10/2011

For something alternative to the rugby for the weekend here is astronomer, author and science blogger Phil Plait giving a TEDx lecture at Boulder, Colorado, on those really big asteroids that have hit the earth and what we might do about those still out there if they head our way:

(I’m not an astronomer, but this is fun to listen to. Yes, the title is a tease.)