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Intro to the Solar System Note 15 Solar System Components: * Sun * 9 planets and their satellites (moons) * Asteroids (various size rocks mainly orbiting between Mars & Jupiter) * Comets (large dirty snowballs!) * Meteoroids Planet Positions * a planet’s orbit lies in a flat plane (like a sheet of paper) * orbital planes of planets are tilted slightly (most are within 3° of Sun’s equator) ° * Mercury is 5 off, Pluto is 17° off Planet Types A. Terrestrial (Earthlike) Planets (AKA inner planets) * includes Mercury, Venus, Earth & Mars * small, dense & rocky - Mercury and Mars have a lot of craters - Earth & Venus don't (Why?) * low escape velocities (easier to leave planet because gravity tends to be less powerful due to their smaller sizes) B. Jovian (Jupiterlike) Planets (AKA outer planets) * includes Jupiter, Saturn, Uranus & Neptune * very large, low density, gaseous * thick atmospheres composed of hydrogen (H), Helium (He), Methane (CH4), Ammonia (NH3) * high escape velocities (hard to leave planet because of strong gravitational pull) C. Pluto – - not included in either group - at times considered to be a satellite of Neptune