Welcome to Planet Earth
Explanation: Welcome to Planet Earth, the third planet from a star named the Sun. The Earth is shaped like a sphere and composed mostly of rock. Over 70 percent of the Earth's surface is water. The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen. The above picture of Earth, dubbed Blue Marble, was taken from Apollo 17 in 1972 and features Africa and Antarctica. It is thought to be one of the most widely distributed photographs of any kind. Earth has a single large Moon that is about 1/4 of its diameter and, from the planet's surface, is seen to have almost exactly the same angular size as the Sun. With its abundance of liquid water, Earth supports a large variety of life forms, including potentially intelligent species such as dolphins and humans. Please enjoy your stay on Planet Earth.The Space Store is an online store offering fine quality space products from our on-line discount store. Shop our store to buy NASA gifts, SpaceX Products, Space Shuttle collectibles, International Space Station and Apollo space program products. Buy astronaut autographs, space and NASA memorabilia and collectibles, space toys, rockets, astronaut dolls, space LEGO toys, and astronaut costumes. We sell NASA flight suits, space shuttle flight jackets, NASA mission patches and mission insignia pins. Shop us for Fisher space pens, meteorite jewelry and astronomy toys.