solar system lore (the text is so small that you can't read so you need to read the description to read it clearly)

The Solar System[c] is the gravitationally bound system of the Sun and the objects that orbit it. 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 most of the remaining mass contained in the planet Jupiter. The four inner system planets—Mercury, Venus, Earth and Mars—are terrestrial planets, being composed primarily of rock and metal. The four giant planets of the outer system are substantially larger and more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the next two, Uranus and Neptune, are ice giants, being composed mostly of volatile substances with relatively high melting points compared with hydrogen and helium, such as water, ammonia and methane. All eight planets have nearly circular orbits that lie close to the plane of the Earth's orbit, called the ecliptic. Solar System A true-color image of the Solar System with sizes, but not distances, to scale. The order of the planets are from right to left. The Sun, planets, and dwarf planets[a] (distances not to scale) Age 4.568 billion years Location Local Interstellar Cloud, Local Bubble, Orion–Cygnus Arm, Milky Way System mass 1.0014 Solar masses Nearest star Proxima Centauri (4.25 ly) Alpha Centauri (4.37 ly) Nearest known planetary system Proxima Centauri system (4.25 ly) Planetary system Semi-major axis of outer known planet (Neptune) 30.10 AU (4.5 bill. km; 2.8 bill. mi) Distance to Kuiper cliff 50 AU Populations Stars 1 (Sun) Known planets 8 declared by IAU: MercuryVenusEarthMarsJupiterSaturnUranusNeptune Known dwarf planets 9 by general consensus: CeresOrcusPlutoHaumeaQuaoarMakemakeGonggongErisSedna Known natural satellites 657 (206 planetary451 minor planetary)[1] Known minor planets 1,199,224[b][2] Known comets 4,402[b][2] Identified rounded satellites 19 Orbit about Galactic Center Invariable-to-galactic plane inclination 60.19° (ecliptic) Distance to Galactic Center 27,000 ± 1,000 ly Orbital speed 220 km/s; 136 mi/s Orbital period 225–250 myr Star-related properties Spectral type G2V Frost line ≈5 AU[3] Distance to heliopause ≈120 AU Hill sphere radius ≈1–3 ly There are an unknown number of smaller dwarf planets and innumerable small Solar System bodies orbiting the Sun.[d] Six of the major planets, the six largest possible dwarf planets, and many of the smaller bodies are orbited by natural satellites, commonly called "moons" after the Moon. Two natural satellites, Jupiter's moon Ganymede and Saturn's moon Titan, are larger but not more massive than Mercury, the smallest terrestrial planet, and Jupiter's moon Callisto is nearly as large. Each of the giant planets and some smaller bodies are encircled by planetary rings of ice, dust and moonlets. The asteroid belt, which lies between the orbits of Mars and Jupiter, contains objects composed of rock, metal and ice. Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of objects composed mostly of ice and rock. In the outer reaches of the Solar System lies a class of minor planets called detached objects. There is considerable debate as to how many such objects there will prove to be.[9] Some of these objects are large enough to have rounded under their own gravity and thus to be categorized as dwarf planets. Astronomers generally accept about nine objects as dwarf planets: the asteroid Ceres, the Kuiper-belt objects Pluto, Orcus, Haumea, Quaoar and Makemake, and the scattered-disk objects Gonggong and Eris, and Sedna.[d] Various small-body populations, including comets, centaurs and interplanetary dust clouds, freely travel between the regions of the Solar System. The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region of interplanetary medium in the interstellar medium known as the 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. 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. The Solar System is located 26,000 light-years from the center of the Milky Way galaxy in the Orion Arm, which contains most of the visible stars in the night sky. The nearest stars are within the so-called Local Bubble, with the closest, Proxima Centauri, at 4.25 light-years. solar system lore