A 6-ton National Aeronautics and Space Administration (NASA) satellite is plummeting back to Earth, the space agency said on Friday. The old spacecraft is expected to hit sometime Friday afternoon or early evening. It will not be passing over North America during that period, and scientists, who are not sure exactly where it will strike, expect it to splashdown into water. The NASA climate satellite is expected to break into more than 100 pieces, and most of it will burn up as it plunges through the atmosphere. The satellite was launched twenty years ago aboard space shuttle Discovery.
