11.   Of particular concern are small particles that are too small to be detected by radar or ground-based tracking systems.

12.   Pearce explained that the plane was below an altitude where it could be detected by radar.

13.   Radar could detect large depressions in the ice cap marking the resting places of large meteoric fragments.

14.   S band radar can detect objects farther through the precipitation than the shorter wavelength C band radar, Murnan explains.

15.   Rotating motions detected by radar in thunderstorm clouds led forecasters to alert mariners for possible waterspouts off the southern California coast on Monday.

16.   Scientists want to determine if the radar can detect and track the oil products and to distinguish them from the oily products of living creatures.

17.   Secret Service officials said the plane apparently was flying too low to be detected by radar and did not have its transponder device turned on.

18.   Stoewer said researchers want to see if the radar can detect and track the oil products, as well as distinguish them from the algae.

19.   Supporters said the Pentagon needs more of the stealth planes, which are difficult for enemy radar to detect.

20.   That means Bush could offer to inform Moscow if U.S. satellites or earth-based radar detected a missile bound for Russia.