Mars: Countdown to Collision?

The odds are still against the asteroid called 2007 WDS colliding with Mars - but they are improving. When I first blogged on this, the odds of a collision with the 50m-wide object were 1 in 75. Now they are 1 in 25. If the collision does take place, reports NASA JPL, it will do so at 2:55 a.m. PST on January 30. Stay tuned....