Our Busy Solar System . ... Although the major planets get the most press, a swarm of rocks, comets, and asteroids also exist. ... The light blue lines indicate the orbits of planets . ... Comets appear as dark blue squares, while dark blue points are Jupiter Trojans , asteroids that orbit just ahead of, or just behind Jupiter. Note that most asteroids of the inner Solar System orbit between Mars and Jupiter in the main asteroid belt . ... NASA Web Site Statements, Warnings, and Disclaimers . ...