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PLANET FACTS General Science 8 Name ________________________ Period _____ A YEAR ON THIS PLANET IS ONLY 88 EARTH DAYS WHICH MAKES IT THE SHORTEST PERIOD OF REVOLUTION OF ALL THE PLANETS; BECAUSE OF THIS, IT WAS NAMED AFTER THE ROMAN MESSENGER GOD OF THE MANY CRATERS IN ITS SURFACE, BACH AND MOZART ARE TWO OF THE NAMES; BECAUSE THERE IS NO ATMOSPHERE OR WEATHER, CRATERS REMAIN FOREVER ALSO BECAUSE IT HAS LITTLE ATMOSPHERE, IT HAS THE GREATEST FLUCTUATIONS IN DAYTIME AND NIGHTIME TEMPERATURES. EXTREMELY HIGH TEMPERATURES DUE TO THE HIGH AMOUNTS OF CARBON DIOXIDE (CO2) IN ITS THICK ATMOSPHERE CAUSING THE GREENHOUSE EFFECT; HOT ENOUGH TO MELT LEAD IT IS THOUGHT TO HAVE HAD A LARGE IMPACT IN ITS HISTORY THAT CAUSED IT TO ROTATE BACKWARDS (RETROGRADE ROTATION) AT A VERY SLOW RATE – A DAY TAKES LONGER THAN A YEAR ON THIS PLANET NICKNAMES FOR THIS PLANET INCLUDE “EARTH’S TWIN,” “THE MORNING STAR,” AND “THE EVENING STAR.” BECAUSE OVER 70% OF ITS SURFACE IS COVERED WITH WATER, THE TEMPERATURE STAYS WITHIN ACCEPTABLE LIMITS FOR LIFE; IN FACT, THIS IS THE ONLY PLANET KNOWN TO CONTAIN LIFE LAYERS OF THIS PLANET INCLUDE THE CRUST, MANTLE AND CORE CALLED THE RED PLANET WHICH ALSO EXPLAINS WHY IT IS NAMED AFTER THE ROMAN GOD FOR WAR IT WAS BELIEVED BY EARLY ASTRONOMERS TO HAVE A SERIES OF CANALS BUILT ON IT BY INTELLIGENT LIFE FORMS (MARTIANS) PHOBOS AND DIEMOS ARE THIS PLANET’S ONLY MOONS THE LARGEST OF THE PLANETS IN OUR SOLAR SYSTEM THE GREAT RED SPOT ON THIS PLANET IS ACTUALLY A HUGE HURRICANE, BIG ENOUGH TO FIT THREE EARTH’S INTO IT ALTHOUGH IT HAS MANY MOONS, THE 4 LARGEST WERE OBSERVED BY GALILEO AS FAR BACK AS 1610; THESE MOONS ARE NAMED IO, EUROPA, GANYMEDE AND CALLISTO IT HAS THE MOST VISIBLE RING SYSTEM, COMPOSED OF MANY ORBITING CHUNKS OF ROCK AND ICE (SATELLITES) TITAN IS THIS PLANET’S LARGEST MOON AXIS IS TILTED 90o SO IT SPINS ON ITS SIDE IT APPEARS BLUE IN COLOR BECAUSE OF THE TRACES OF METHANE GAS IN ITS ATMOSPHERE IT WAS DISCOVERED BY ENGLAND AND FRANCE BY A MATHEMATICALLY EQUATION BEFORE IT WAS ACTUALLY SEEN BY A GERMAN ASTRONOMER NAMED AFTER THE GOD OF THE SEA; RELATED TO THIS IS THE FACT THAT ITS LARGEST MOON IS NAMED TRITON ITS ORBIT CROSSES WITH PLUTO’S ORBIT SOMETIMES MAKING IT FARTHER FROM THE SUN, BUT NOT VERY OFTEN BECAUSE OF ITS SIZE, IT WAS RECLASSIFIED AS A DWARF PLANET IN 2006. IT HAS ONE MOON THAT IS NEARLY AS BIG AS ITSELF. THE MOON’S NAME IS CHARON AND THEY ORBIT EACH OTHER