The fifth planet from the sun and largest planet in the solar system with 1321 times the volume of the Earth is Jupiter! It's mass is more than twice that of all the other solar system planets combined! Currently there are 67 known moons orbiting Jupiter and it has the fastest rotation in the solar system, completing rotation every ten hours. It's red spot is a storm more than twice the size of earth that has been raging for at least 300 years. It is a gas giant without a solid surface and an atmosphere made up of mostly hydrogen and helium. The latest probe sent to patrol the gas giant is Juno, which just days ago spotted giant cyclones swirling at Jupiter's north and south poles. Scientists hope that Juno will help solve the question of whether the planet contains a solid core.
Jupiter has been known about for a long time because of its size and its visibility to the naked eye. The babylonians associated Jupiter with their god Marduk, ruling over judgement and magic, and used Jupiter's 12 year orbit to define the constellations of their zodiac. Jupiter (or Jove) is named for the principal Roman god of the sky and lightening. The name means both "father sky god" as well as "happy" or "merry" as in the case of "jovial." Zeus is the Greek equivalent, presiding over the sky, lightening, law, order and justice. The astrological symbol for Jupiter ♃ is a stylized representation of Zeus's lightening bolt. Chinese Taoism has named it the Fu (prosperity) star, and in Vedic astrology, it has been named after the Hindu god Brihaspati. In Germanic mythology, Jupiter has been equated with Thor and is from where the English name "Thursday" is derived.
In astrology, Jupiter rules Sagittarius and is called the planet of plenty. It is usually associated with good luck and fortune, though it can also be linked to excess and blind optimism. In the birth chart, look to Jupiter's placement to see how generosity and optimism is expressed. Jupiter governs travel, business, wealth, education, religion and the law. In the tarot, Jupiter is associated with the Emperor, who represents authority, structure and solid foundations.