Planets The Order of the Planets 1. 2. 3. 4. 5. 6. 7. 8. 9. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto Inner Planet (Terrestrial) -Mercury -Venus -Earth -Mars Outer Planet (Gas Giant) Jupiter Saturn Uranus Neptune Retrograde Rotation (spins backwards) Venus Uranus Pluto Smaller Than Earth Mercury Venus Mars Pluto No Moons Mercury Venus Has a ring system Jupiter Saturn Uranus Neptune No Solid Surface Jupiter Saturn Uranus Neptune Too far away to see without a telescope. Uranus Neptune Pluto Mercury: Closest to the Sun Shortest Revolution Venus: Close in size to Earth “Earth’s Twin” Hottest Average Temp. Very thick atmosphere Compare the sizes of the Terrestrial Planets: Earth: 1 moon (Luna) Has liquid water Has the only known life Mars: 2 Moons Thin Atmosphere The “Red Planet” Tallest volcano in solar system Jupiter Largest Planet Made mostly of H and He Many moons (about 64) Has a red spot (1.5 X the diameter of Earth) Radiates more heat than it gets from the Sun Compare the sizes of the Gas Giants Saturn: Made mostly of H and He Many moons (about 32) Less dense than water Largest rings Uranus: Much smaller than Jupiter and Saturn Axis tilted at a 90 degree angle Has many moons (27) Neptune: Much smaller than Jupiter and Saturn Many moons (13) “Windy Planet” Pluto: Smallest Planet Farthest out from the sun - coldest planet 1 moon which is more than half the size of Pluto Orbit is so elliptical that it’s path is inside Neptune’s for 20 years It just became last again in 2005. Compare the size of the Sun to all 9 Planets!