When worlds collide? Comet C/2013 A1 may hit Mars next year

2013 is promising (or threatening, depending on the stock one puts in omens) to be an incredible year for comets in our sky.  Depending on where you live there are two and maybe even three of those cosmic iceballs that may give us quite a show.  In a few short weeks Comet PANSTARRS will become visible to the naked eye in the Northern Hemisphere: perhaps more brilliant...

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The trees of Mars

Not really trees, but an optical illusion captured by NASA's HiRISE camera in orbit around the red planet. What appears to be a scattering of pine trees is actually several trails of debris near Mars's north pole, left behind as the ice cap goes on its seasonal retreat.Mash down here for more about the "trees" of Ma...

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