WASHINGTON The chance that an asteroid capable of wiping out a city will hit Earth in eight years has been cut in half to around 1.5 percent, according to new calculations from NASA. The drop in odds had been widely anticipated by the global astronomical community, which now broadly expects the probability the asteroid will hit Earth on December 22, 2032 to fall down to zero. For more than 24 hours, the asteroid did have the highest probability of hitting Earth — 3.1 percent — of such a big