Like the sun, Jupiter is composed predominantly of hydrogen & helium. But unlike the sun, it lacks the necessary amount to begin fusion, the process that fuels a star. Jupiter would need to be 75-80 times more massive than it is at present to be considered a star. If all of the planets in the solar system had formed as part of the gas giant, it still would not have sufficient mass. Still, by itself, Jupiter is 2 & 1/2 times larger than all of the other planets in the solar system combined.
callisto. one of jupiter's moons and one of my very favorite things in space. - Bing Images
Interesting one by hythamsafieh #astrophotography #contratahotel (o) http://ift.tt/1THT6LO from my home's driveway in #Minnesota Jupiter accompanied by two of the four Galilean moons: Io (bottom right casting a shadow towards the bottom left of Jupiter's surface) and Ganymede top left. Jupiter is the largest planet in our Solar System holding over double the mass of all of the other planets combined but still only comprises 1/1000th the mass of our Sun. Fun facts about Jupiter: - It has a…