Mars to be hit by an Asteroid

"Asteroid 2007 WD5 is expected to hit Mars on January 30, 2008 with odds of impact at 1 in 75. The speed of the asteroid will reach 12.8 km/h. The crater that will be left on Mars after the impact will be similar to the well-known Meteor Crater in the state of Arizona.

The impact produced a massive explosion equivalent to at least 2.5 megatons of TNT – equivalent to a large thermonuclear explosion and about 150 times the yield of the atomic bombs used at Hiroshima and Nagasaki. The explosion dug out 175 million tons of rock. The shock of impact propagated as a hemispherical shock wave that blasted the rock down and outward from the point of impact, forming the crater. Much more impact energy, equivalent to an estimated 6.5 megatons, was released into the atmosphere and generated a devastating above-ground shockwave." (source)

It's going to happen unless something obstructed its path. But wow, I wonder if it would have any after effects onto us. Hope not, it'll be too much.