Over the past few years, we've begun to find these orphan planets - sometimes called rogue planets - in the spaces between stars. Based on what we know of stars, gravity, and cosmic evolution, we can make a ballpark estimate of the total number of planets in the Universe, and it likely outnumbers our stars by anywhere from a factor of 10 to 100,000.
Studies of exoplanets have shown us, through both the transit method and the stellar wobble method, that not only do most (if not all) stars likely have planets around them, most of them likely have worlds with a variety of masses, sizes, and orbital periods around them.
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