These are exoplanets, planets orbiting around a star other than the sun. Exoplanets are very common in the universe. The average star has more than one planet orbiting around it, making our solar system the rule rather than the exception.

These are all 1963 known and confirmed exoplanets, but shown rotating around a single star. Try scrolling to get the complete picture: orbits of the inner planets in our solar system are highlighted.