The solar system contains numerous asteroids as well as small celestial bodies beyond Neptune. Using interval observations, these objects can be seen moving against the background stars. The Subaru Telescope can find these objects effectively by using the wide view of its prime focus camera. For example, astronomers conducted surveys of small bodies in the solar system and found that the craters on the Moon were created by asteroids. The census of asteroids also revealed that Jupiter moved away from the sun after its formation in the beginning of solar system. With the wide-field imaging capability, the Subaru Telescope will play an important role in probing unknown planets at the edge of the solar system.