Within our solar system , an extra giant planet, or possibly two, might once have accompanied Jupiter, Saturn, Neptune and Uranus. [More]
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Feed SubscriptionResearchers develop high-performance bulk thermoelectrics
(PhysOrg.com) -- Roughly 10 billion miles beyond Neptune's orbit, and well past their 30th birthdays, Voyagers 1 and 2 continue their lonely trek into the Milky Way.
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