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Now's a great time to break out that backyard telescope. Because Saturday, March 3, is the Mars Opposition . It's one of the times that the Earth and Mars pass the closest to one another

On November 8th, Earth will have a close encounter with a sizable asteroid. But not too close, thankfully

Look out below! A defunct satellite the size of a school bus is falling back to Earth. NASA's Upper Atmosphere Research Satellite, or UARS , is expected to reenter the atmosphere at the end of September.