Mysterious dimmings from a faraway star spur speculation about "alien megastructures," some rivers on ancient Mars were dozens of miles long and Pluto's many mysteries continue to intrigue researchers. Here are Space.com's top stories of the week.
Mysterious dimmings from a faraway star spur speculation about "alien megastructures," some rivers on ancient Mars were dozens of miles long and Pluto's many mysteries continue to intrigue researchers. Here are Space.com's top stories of the week.
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