The Solar System formed 4. 6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system’s mass is in the Sun, with the majority of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.
Solar System Hubble solar system artist39s impression esahubble Solar Hubble System .
Solar System Hubble hubble detects exoplanet with glowing water atmosphere Hubble System Solar .
Solar System Hubble virtual tour in our solar system artist39s impression System Solar Hubble .
Solar System Hubble hubble spots an unusual object in our solar system System Hubble Solar .
Solar System Hubble hubble charts path of the voyager probes out of the solar Solar System Hubble .
Solar System Hubble nasa discovers 100 new planets beyond our solar system System Solar Hubble .
Solar System Hubble hubble telescope launch solar walk app 3d solar system Hubble System Solar .
Solar System Hubble hubble space telescope photos images celebrating the System Solar Hubble .
Solar System Hubble planet 9 meet our solar system39s 39new pluto39 time Hubble Solar System .
Solar System Hubble hubble discovers a unique type of object in the solar system Hubble Solar System .
Solar System Hubble hubble just discovered a new moon hiding in our solar system Solar System Hubble .
Solar System Hubble hubble goes to the extreme to assemble farthest ever view Solar Hubble System .
Solar System Hubble hubble spots a never before seen object in our solar system Solar System Hubble .
Solar System Hubble hubble space telescope photos images celebrating the System Solar Hubble 1 1.
Solar System Hubble solar system hubble System Hubble Solar .
Solar System Hubble birth of a solar system the first ever high resolution Solar Hubble System .
Solar System Hubble intriguing new hubble photos hint at solar system origins System Solar Hubble .
Solar System Hubble flight through our solar system esahubble Solar Hubble System 1 1.
Solar System Hubble bw color prints science on a sphere datasets Hubble System Solar .
Solar System Hubble nasa hubble finds a true blue planet nasa Solar System Hubble .
Solar System Hubble video archive solar system esahubble Hubble System Solar .
Solar System Hubble solar system to the deep hubble field youtube Hubble System Solar .
Solar System Hubble flight through our solar system esahubble Solar Hubble System .
Solar System Hubble nasa39s hubble harvests distant solar system objects Solar Hubble System .
Solar System Hubble intriguing new hubble photos hint at solar system origins Solar Hubble System .
Solar System Hubble nasa39s hubble telescope finds asteroids in way of distant Hubble Solar System .
Solar System Hubble hubble discovers a unique type of object in the solar Solar System Hubble .