Considering our methods of exploration, how likely is it that there are unfound planets (not dwarf planets) in our solar system?
Why do planets and satellites in the Solar system look so wildly different if they came from more or less the same matter?
Where was the solar system born? Alternatively, how far back in time can we retrodict the location of the solar system?
Is it at all possible for the sun to revolve around as many barycenters as we have planets in our solar system?
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