WebFeb 15, 2024 · Reported discoveries of new planets picked up pace in the 20th century, but there was a problem. Jack Lissauer: “There were headlines in the ’60s, in the early ’80s, about first exoplanets discovered — first planets outside our solar system. But the fact they were all claiming ‘the first’ means that they weren’t right.”. WebMay 28, 2024 · Planet Nine is theorized to be five to 10 times as massive as Earth, with an orbit ranging between 300-700 AU. There have been several published predictions for its location in the solar system ...
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