I DON'T WANT TO BE DIFFICULT, BUT IN THIS CASE I'D SAY 90% ISN'T GOOD ENOUGH
Without more funding, NASA will not meet its goal of tracking 90 percent of all deadly asteroids by 2020, according to a report released today by the National Academy of Sciences.
The agency is on track to soon be able to spot 90 percent of the potentially dangerous objects that are at least a kilometer (.6 miles) wide, a goal previously mandated by Congress.