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By Rebecca Jacobson, Inside Energy
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…
By PBS NewsHour
After a 10-year journey, the space probe Rosetta is orbiting a comet. The spacecraft is slated to follow the comet for more than a year on its way toward the sun. Hari Sreenivasan talks to Mark McCaughrean, senior scientific advisor…
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