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Our Solar System The Sun is the center of the solar system. Sun The sun is a star. It is made of hydrogen and heliums. There are storms on the sun. Mercury Mercury Mercury is like a big rock. It has no atmoshpere. It has many craters because comets and asteroids hit it. Venus Venus Venus is like a big oven because its clouds make it have a greenhouse effect. There are pancake volcanoes on venus. Earth Earth The Earth is our home. It is a special planet because it has life. There is water and an atmoshere around the Earth. The Earth has a moon. Our Moon: Luna Astronauts Walked on the Moon On July 20, 1969, Commander Neil Armstrong became the first man on the moon. He said the historic words, "One small step for man, one giant leap for mankind." Mars Rovers are on Mars: Spirit and Opportunity This is a rover: They were sent to Mars to explore it and to try and find water or life. Jupiter Jupiter is really big. It has a storm on it called the Great Red Spot. It is a gas planet. Saturn Saturn Saturn is really cool. It has rings that are made of ice chips. It is not dense. It could float in a bucket of water. It is a gas planet. Uranus Uranus is very cold. It is the third largest planet in the solar system. It is tipped on its side. It is a gas planet. Neptune Neptune is the home of the Great Dark Spot. The winds in the Great Dark Spot are the fastest in the solar sytem. Neptune is a gas planet. Pluto Pluto is very cold. It is the last named planet. It is the smallest planet. Sedna Sedna is the next possible planet. Astronomers have decided that for now they will call it a planetoid.