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The Earth's rotation about its axis is slowing, from the fossil record there were many more days in a year, (i.e. Earth used to spin quicker), e.g. there were about 377 days in a year when the dinosaurs were knocking about.
Is this slowing down a problem?
Why the orbits are nearly circular and how the planets actually formed- rather than a ring structure like the one around Saturn is complicated but it is a pattern of many other SSs that the dense rocky planets are close in and the gas giants are further out.
Don't know the names but Google "extra solar planetary systems" you will get several hits.