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Within our solar system, an extra giant planet, or possibly two, might once have accompanied Jupiter, Saturn, Neptune and Uranus. Computer models showing how our solar system formed suggested the planets once gravitationally slung one another across space, only settling into their current orbits over the course of billions of years.
Originally posted by LookSkywatcher
hmmm Planet X does not exist but a Planet or two might have been here billions of years ago?
maybe the Sumerian story ain't wrong after all.
"This is just a beginning," Nesvorny said. "It will need quite a lot of work to see if there actually was the fifth planet. I am not fully convinced myself."