Jupiter is the largest of all the planets, yet it consists entirely of gas. Jupiter is the King of the Gods - a bit larger than life. In the Greek Pantheon Jupiter was the head of the Olympian family over which he ruled with the help of his formidable thunderbolt. Although awesome, he is generally considered benevolent and fair. He was a very amorous God and never stingy with his affections, much to the vexation of his jealous wife.
Astrologically, Jupiter represents the principle of hope, faith and vision. It is the personal quest for meaning, the inspiration to better ourselves, to aim for our dreams and visions, to take a gamble and reach for the stars. Jupiter signifies spirituality, soul-growth and development - all that which expands our inner and outer horizons. However, Jupiter can also have a voracious appetite for fun and food and may be responsible not just for expanding mental horizons, but the waistline too.