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PBS News Hour

Tracking killer comets before they strike

It's only a matter of time before a big comet or asteroid is on a collision course with Earth. Will scientists discover it, and be able to do something about it, ahead of time? Science correspondent Miles O'Brien talks to NASA astronomers who troll for trouble in the sky.

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July 23, 2020 - PBS NewsHour full episode
56:45
July 23, 2020 - PBS NewsHour full episode
July 22, 2020 - PBS NewsHour full episode
56:45
July 22, 2020 - PBS NewsHour full episode
July 21, 2020 - PBS NewsHour full episode
57:46
July 21, 2020 - PBS NewsHour full episode
July 17, 2020 - PBS NewsHour full episode
57:46
July 17, 2020 - PBS NewsHour full episode
July 16, 2020 - PBS NewsHour full episode
56:44
July 16, 2020 - PBS NewsHour full episode
July 14, 2020 - PBS NewsHour full episode
56:45
July 14, 2020 - PBS NewsHour full episode
July 13, 2020 - PBS NewsHour full episode
56:44
July 13, 2020 - PBS NewsHour full episode
July 9, 2020 - PBS NewsHour full episode
56:44
July 9, 2020 - PBS NewsHour full episode
July 7, 2020 - PBS NewsHour full episode
56:44
July 7, 2020 - PBS NewsHour full episode
July 6, 2020 - PBS NewsHour full episode
56:42
July 6, 2020 - PBS NewsHour full episode
July 1, 2020 - PBS NewsHour full episode
56:51
July 1, 2020 - PBS NewsHour full episode
June 30, 2020 - PBS NewsHour full episode
57:46
June 30, 2020 - PBS NewsHour full episode
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