Not an astronomer but if I'm not mistaken, we find exoplanets based on the shadows from their respective stars, we can usually tell if a star has multiple planets orbiting based on the amount of light we see, it's just that it's strangely more common to only have 1 planet orbiting each star, instead of the many we have.
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Not an astronomer but if I'm not mistaken, we find exoplanets based on the shadows from their respective stars, we can usually tell if a star has multiple planets orbiting based on the amount of light we see, it's just that it's strangely more common to only have 1 planet orbiting each star, instead of the many we have.