The Solar System consists of the Sun; the eight official planets, at least three 'dwarf planets', more than 130 satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium.
Planets can be grouped by size; by position relative to the Sun; by position relative to Earth or by history. By size, the four giant planets are Jupiter, Saturn, Uranus and Neptune. To qualify as a giant, a planet must be greater than 48,000 km. The giants are sometimes referred to as gas giants. Of the eight official planets, this leaves Mercury, Venus, Earth and Mars which are known as small planets.
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He was a Soviet pilot and cosmonaut. He orbited Earth on 12 April 1961
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Triton is the only large moon in the Solar System to orbit 'backwards'
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Makemake was chosen in part to preserve the object's connection with Easter
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Mercury and Venus occult each other every few centuries, and the event of May 28, 1737 is the only one historically observed. The next occultation of Mercury by Venus will be on December 3, 2133
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Saturn, the Bringer of Old Age, is one of the seven movements of the suite
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Mathematical models suggest that the storm is stable and may be a permanent feature of the planet
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The book has sold more than 7 million copies and is reported to be one of the best selling self-help books of all time
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