Current theories about its origin provide new clues to the genesis of the solar system Pluto, our sun's most remote and mysterious planet, may once a satellite of Neptune.
On Neptune far out in the solar system it’s a different story—but what happens on the ice giant planet nevertheless appears to be inextricably linked to the same solar cycle. Having looked at ...
Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.
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