For the first time, astronomers have discovered the "snow
line" for a particularly frosty star system 175 light-years away -- but
there's no word on the quality of the snow for slaloming.
On Friday, Saturn won't be the only planet that will get
photobombed by Earth; the MESSENGER spacecraft will also be taking
pictures from the other end of the solar system.
At one time, Mars had a thick, protective atmosphere --
possibly even cushier than Earth’s -- but the bubble of gases mostly
dissipated about 4 billion years ago and has never been replenished.
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