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Dotted line = Mountain fold Dashed line = Valley fold SOLAR SYSTEM Revision Book The Sun is the Star at the centre of the Solar System. It is almost perfectly spherical and consists of hot plasma made from Hydrogen. The Sun contains around 98% of all the material in the Solar System. Mercury is the closest planet to the Sun and due to its proximity it is not easily seen except during twilight. For every two orbits of the Sun, Mercury completes three rotations about its axis. Mercury Neptune Neptune is the eighth planet from the Sun and is the most distant planet. Sun Solid Line = Cut along Fifth planet from the Sun and is 2 ½ times bigger than all the other planets in the solar system combined. The largest of the gas giants. Jupiter Uranus is the seventh planet from the Sun. It is not visible to the naked eye and became the first planet discovered with the use of a telescope. Uranus is tipped over on its side with an axial tilt of 98o. Asteroid Belt Saturn is the sixth planet from the Sun and the most distant that can be seen with the naked eye. It is best known for its fabulous ring system that was discovered in 1610 by the astronomer Galileo Galilei. Mars Uranus Earth Saturn Venus A group of billions of rocky objects orbiting the Sun between Mars and Jupiter. Some asteroids are quite large but most are smaller in size down to the size of pebbles. A moon is a body that orbits a planet in the Solar System. There are over 170 natural moons that have been discovered so far. A single moon orbits the Earth. Moons Mars is the fourth planet from the Sun. It is named after the Roman god of war and it is often described as the red planet due to its reddish appearance. Small objects made of rock and ice that orbit the Sun in very elliptical orbits. When they pass close to the Sun they warm up and the solar wind from the Sun drives material away to form a visible tail. Comets Earth is the third planet from the Sun and is the largest of the terrestrial planets. The name comes from the Anglo-Saxon word erda which means ground or soil. Venus is the second planet from the Sun and is the second brightest object in the night sky after the Moon. Named after the Roman goddess of love and beauty, Venus is the second largest terrestrial planet. Pluto Pluto was known as the smallest planet in the solar system and the ninth planet from the sun. Today, Pluto is called a "dwarf planet" as it orbits the sun just like other planets but it is much smaller.