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The Inner planets Aka: Terrestrial planets Mercury Closest planet to the sun About the size of our moon Mercury has a very thin atmosphere. The gasses were super hot and moving fast. So fast that the atmosphere escaped the weak gravity. Typical Temp: H= 430°C L=-170°C Venus Seen from earth just after sunset in the west. Also known as the evening star. So close to the size of the earth that it is called “Earth’s Twin” Venus rotates on its axis so slowly its day is longer than a its year Very hostile atmosphere. The atmosphere pressure is 90 times greater than ours. Venus clouds are made of sulfuric acid. Typical Temp. A constant 460°C Hot enough to melt lead. Mars Called the “Red Planet” Water does exist on Mars locked up as Ice on the North Pole. Home to Olympus Mons the largest volcano in the solar system. It is 3 times larger than Mt. Everest. Or 90,000 Feet tall! Temperatures H= -17°C L= -107°C Relative size of the planets