Comet

Comets are unsteady body, which usually include little not many kilometers in distance. When you are at a great distance from the Sun are down, its small core, which can vary from a few hundred meters to about 10 km. only reflects light. Near the sun the core is surrounded by a "head", the comma, whose diameter can be up to 30,000 km. The coma is composed of gas emerged from the nucleus by sublimation and dust. Its production increases severely as we advance the Sun.

Planets

Spitzer will revise some of the known planets and their moons, and comets, asteroids and dust spread throughout the solar system. The Centre will employ a significant portion of his time studying circumstellar disks (that surround the stars) of dust and gas found in the nearby stars and thought to eventually form planetary systems 'extra solar' (outside our Solar System) .