The ESA/Rosetta cometary mission was launched in March 2004. The spacecraft was set on a complex interplanetary orbit in order to reach and escort the main mission target, comet 67P/Churyumov-Gerasimenko in 2014. Rosetta performed three Earth and one Mars gravitational assists and two passages through the asteroid main belt between the orbits of Mars and Jupiter. During the journey, the onboard two-cameras OSIRIS instrument obtained unique images of solar system objects. In this talk the OSIRIS main scientific results obtained so far, regarding observations of the NASA/Deep Impact target comet 9P/Tempel 1, the martian moon Phobos, and the two main belt asteroids (2867) Steins and (21) Lutetia, are presented.