But their range is limited by Earth’s curvature, and neither they nor orbiting satellites are powerful enough to determine whether approaching objects are benign or threatening. The radar’s field of vision is extremely narrow: 25 degrees, compared with 90 to 120 degrees for conventional radars. One searches widely for threats. He put up for sale the company's 25 percent interest in Comcast SportsNet Chicago. The two radars are well positioned to detect launches from North Korea. Its sensitive instrumentation is prone to corrosion at sea, and it needs millions of dollars in fuel to operate for

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