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AstronomyOur first interstellar visitor may be a camouflaged comet
Originally thought to be a rocky asteroid, an interstellar traveler may have a comet’s icy heart.
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Science & SocietyHere are our favorite science books of 2017
Science News writers and editors make their picks for top science books of the year.
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AnimalsIn marine mammals’ battle of the sexes, vaginal folds can make the difference
Patricia Brennan and colleagues found certain female ocean mammals have vaginal folds that give them an advantage in mating
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AstronomyAI has found an 8-planet system like ours in Kepler data
An AI spotted an eighth planet circling a distant star, unseating the solar system as the sole record-holder for most known planets.