Earlier in this book we saw how astronomers think the Solar System was formed from a rotating cloudlet that span into a disk, with the Sun formed at its central hub while the planets formed from rings of matter in the orbiting disk. Since other stars are also formed from similar rotating cloudlets, you might have wondered whether planetary systems perhaps surround other stars. Most astronomers also wondered this and many worked hard to find out. In time some positive evidence began to accumulate, but the really indisputable proof came in late 1995. We now know for sure that our Solar System is not unique. At least some other stars do, indeed, act as parents to their own families of planets.
KeywordsNeutron Star Spectral Type Proper Motion Planetary System Extrasolar Planet
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