text: NASA: 1,000 Near-Earth Objects Larger than One Kilometer Sighted - The Daily Galaxy --Great Discoveries Channel
  Of the 10,000 discoveries, roughly 10 percent are larger than six tenths of a mile (one kilometer) in size - roughly the size that could produce global consequences should one impact the Earth. However, the NASA NEOO program has found that none of these larger NEOs currently pose an impact threat and probably only a few dozen more of these large NEOs remain undiscovered. Ninety-eight percent of all near-Earth objects discovered were first detected by NASA-supported surveys.