Hi Sammi
Scientist are VERY sure that they have found planets around other stars...to date about 500 extra-solar planets (or exoplanets) have been confirmed. Most of these exoplanet detections are indirect, that is, evidence of the planet comes from its effect on its star. However, for two star-exoplanet system, the planets have been photographed directly! It is very exiting! Wikipedia has a good article on Extrasolar planets.
Paulett