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Depends on what you mean by star systems. If you mean solar systems, we use two main ways to determine if there are planets. We use the "wobble" method, in which the planet causes the star to wobble. We can tell the orbital speed and size of the planet by the frequency of the wobble. We also use the light of the star itself. If a large enough planet passes in front of the star, it will dim slightly. We can also tell the approximate size and orbital period of the plane by how often, and to what extent the star dims.

Star systems can consist of one or more stars (the Alpha Centauri system has three stars orbiting each other).

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