Mars is in the Andromeda galaxy.
The Solar SystemCapitalization of the name varies .. The International Astronomical Union , the authoritative body regarding astronomical nomenclature , specifies capitalizing the names of all individual astronomical objects , but uses mixed `` Solar System '' and `` solar system '' in their naming guidelines document .. International Astronomical Union. International Astronomical Union. The name is commonly rendered in lower case -LRB- `` solar system '' -RRB- , as , for example , in the Oxford English Dictionary and Merriam-Webster 's 11th Collegiate Dictionary .. Oxford English Dictionary. Oxford English Dictionary. is the gravitationally bound system comprising the Sun and the objects that orbit it , either directly or indirectly.The natural satellites -LRB- moons -RRB- orbiting the Solar System 's planets are an example of the latter .. Sun. Sun. gravitationally. gravity. natural satellites. natural satellites. planets. List of gravitationally rounded objects of the Solar System#Planets. moons. Natural satellite. Of those objects that orbit the Sun directly , the largest eight are the planets , Historically , several other bodies were once considered planets , including , from its discovery in 1930 until 2006 , Pluto .. Sun. Sun. Pluto. Pluto. planets. List of gravitationally rounded objects of the Solar System#Planets. See Former planets .. planets. List of gravitationally rounded objects of the Solar System#Planets. Former planets. Planet#Former planets. with the remainder being significantly smaller objects , such as dwarf planets and small Solar System bodies .. planets. List of gravitationally rounded objects of the Solar System#Planets. small Solar System bodies. Small Solar System body. Of the objects that orbit the Sun indirectly , the moons , two are larger than the smallest planet , Mercury.The two moons larger than Mercury are Ganymede , which orbits Jupiter , and Titan , which orbits Saturn .. Sun. Sun. Mercury. Mercury ( planet ). Jupiter. Jupiter. Saturn. Saturn. planet. planet. moons. Natural satellite. Ganymede. Ganymede ( moon ). Titan. Titan ( moon ). Although bigger than Mercury , both moons have less than half the mass of Mercury .. Mercury. Mercury ( planet ). moons. Natural satellite. mass. mass. The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud .. formed 4.6 billion years ago. Formation and evolution of the Solar System. gravitational collapse. gravitational collapse. molecular cloud. molecular cloud. The vast majority of the system 's mass is in the Sun , with the majority of the remaining mass contained in Jupiter .. Sun. Sun. Jupiter. Jupiter. mass. mass. The four smaller inner planets , Mercury , Venus , Earth and Mars , are terrestrial planets , being primarily composed of rock and metal .. Mercury. Mercury ( planet ). Venus. Venus. Earth. Earth. Mars. Mars. planets. List of gravitationally rounded objects of the Solar System#Planets. The four outer planets are giant planets , being substantially more massive than the terrestrials .. planets. List of gravitationally rounded objects of the Solar System#Planets. 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 .. Jupiter. Jupiter. Saturn. Saturn. Uranus. Uranus. Neptune. Neptune. planets. List of gravitationally rounded objects of the Solar System#Planets. hydrogen. hydrogen. helium. helium. volatiles. volatiles. ammonia. ammonia. methane. methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic .. planets. List of gravitationally rounded objects of the Solar System#Planets. ecliptic. ecliptic. The Solar System also contains smaller objects .. The asteroid belt , which lies between the orbits of Mars and Jupiter , mostly contains objects composed , like the terrestrial planets , of rock and metal .. Mars. Mars. Jupiter. Jupiter. planets. List of gravitationally rounded objects of the Solar System#Planets. asteroid belt. asteroid belt. Beyond Neptune 's orbit lie the Kuiper belt and scattered disc , which are populations of trans-Neptunian objects composed mostly of ices , and beyond them a newly discovered population of sednoids .. Neptune. Neptune. Kuiper belt. Kuiper belt. scattered disc. scattered disc. Within these populations are several dozen to possibly tens of thousands of objects large enough that they have been rounded by their own gravity .. gravity. Gravitation. Such objects are categorized as dwarf planets .. planets. List of gravitationally rounded objects of the Solar System#Planets. Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris .. Ceres. Ceres ( dwarf planet ). Pluto. Pluto. Eris. Eris ( dwarf planet ). planets. List of gravitationally rounded objects of the Solar System#Planets. In addition to these two regions , various other small-body populations , including comets , centaurs and interplanetary dust clouds , freely travel between regions .. centaurs. Centaur ( minor planet ). Six of the planets , at least four of the dwarf planets , and many of the smaller bodies are orbited by natural satellites , See List of natural satellites of the Solar System for the full list of natural satellites of the eight planets and first five dwarf planets usually termed `` moons '' after the Moon .. natural satellites. natural satellites. planets. List of gravitationally rounded objects of the Solar System#Planets. moons. Natural satellite. List of natural satellites of the Solar System. List of natural satellites of the Solar System. Moon. Moon. Each of the outer planets is encircled by planetary rings of dust and other small objects .. planets. List of gravitationally rounded objects of the Solar System#Planets. The solar wind , a stream of charged particles flowing outwards from the Sun , creates a bubble-like region in the interstellar medium known as the heliosphere .. Sun. Sun. solar wind. solar wind. interstellar medium. interstellar medium. heliosphere. heliosphere. The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of the interstellar medium ; it extends out to the edge of the scattered disc .. scattered disc. scattered disc. solar wind. solar wind. interstellar medium. interstellar medium. heliopause. Heliopause ( astronomy ). The Oort cloud , which is thought to be the source for long-period comets , may also exist at a distance roughly a thousand times further than the heliosphere .. heliosphere. heliosphere. Oort cloud. Oort cloud. The Solar System is located in the Orion Arm , 26,000 light-years from the center of the Milky Way .. Milky Way. Milky Way. Orion Arm. Orion Arm