Sky Spy: Equinox marks spring's official start
Tim Hunter took this photo of Comet PANSTAARS near the crescent moon last week. He used a 135 mm lens on a Nikon digital camera.
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Spring officially began Wednesday at 4:02 a.m. Tucson time. This brief moment in time is off…
Lake Mead's drops raise prospect of unaffordable Hoover Dam electricity
