If Earth was hit by a meteorite bigger than Earth, would life on Earth be wiped out completely?

Question: If Earth was hit by a meteorite bigger than Earth, would life on Earth be wiped out completely?
- Keywords:
  end of the world
Asked by treehugger15 to Andrew, Katie, Sadaf on 27 Jun 2013.
- Andrew Swale answered on 27 Jun 2013:
  
  Almost certainly – an asteroid that is only a mile wide would wipe out most life on the planet therefore one infinitely larger would have a devastating effect

Question: If Earth was hit by a meteorite bigger than Earth, would life on Earth be wiped out completely?