Meet Me in the Orion Arm Our solar system orbits the center of the Milky Way galaxy at about 515,000 mph (828,000 kph). We're in one of the galaxy's four spiral arms. How many solar system do we have now? The four inner solar system planets (Mercury, Venus, Earth, and Mars) fall under the category of terrestrial planets; Jupiter and Saturn are gas giants (giant plants composed mostly of hydrogen and helium) while Uranus and Neptune are the ice giants (containing mainly elements heavier than hydrogen and helium). What region is our solar system in? The Solar System is divided into two main regions, each consisting of four primary planets. Mercury, Venus, Earth, and Mars create the inner region, while Jupiter, Saturn, Uranus, and Neptune make up the outer region. What type of system is our solar system? Planetary numbers Data Systems Solar Star Miles Per Hours MPH. Light Years ago. Planetary system Spectral type G2V Frost line ≈5 AU ...