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The Solar System Mercury • The first and smallest planet in the solar system • The surface temperature is 442.5 K • Mercury is similar in appearance to the Moon with mare-like plains and heavy cratering Venus • The second closest planet to the Sun • Named after Venus the Roman goddess of love • Has the densest atmosphere of all terrestrial planets mostly of carbon dioxide Earth • The third planet from the sun and the largest terrestrial planet in diameter, mass, and density • The only place in the universe where life is known to exist • About 71% of the ocean is covered with salt water oceans and the rest with continents and islands Mars • The fourth planet from the Sun named after the Roman god of war • Has a red appearance because of iron oxide on its surface • Has the highest known mountain in the Solar System, Olympus Mons, and the largest canyon, Valles Marineris Jupiter • Fifth planet from the sun and the largest planet in the Solar System • Considered a gas giant planet • Mostly made out of hydrogen and a little bit of helium • Has a giant storm known as the Great Red Spot Saturn • The sixth planet from the Sun and the second largest planet in the Solar System • Has a system of rings that are made of ice particles with small amounts of rocky debris and dust • 61 moons orbit Saturn Uranus • The seventh planet from the Sun named after the Greek deity of the sky Uranus • Has the coldest planetary atmosphere of the Solar System of 49 K • Has a ring system, magnetosphere, and many moons Neptune • The eighth planet from the Sun named after the Roman god of the sea • Discovered by mathematical prediction instead of by empirical observation • The inside of Neptune is made up of ices and rock Credits Text & Photos Wikipedia