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Why do other planets exist in our solar system?

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How soon that can happen depends on two unknowns: the prevalence of life in the galaxy and how lucky we get as we take those first, tentative, exploratory steps. ... read more

It's a lot more complicated than that - a lot of people say that some of the planets moved from their original orbits due to the gravity of other planets - but the general idea is that each planet dominates its own region of the solar system. read more

It's impossible to say what our solar system would be like if the other planets did not exist, except that it would be completely different. All of that matter had to go *somewhere.* Maybe it would have concentrated in the sun and made it much bigger than it is. read more

If Planet Nine is real, it would fill a notable gap in our solar system, they added. "One of the most startling discoveries about other planetary systems has been that the most common type of planet out there has a mass between that of Earth and that of Neptune," Batygin said. read more

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