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The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury. 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 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 ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic. Solar energy is radiant light and heat from the Sun harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture and artificial photosynthesis. It is an important source of renewable energy and its technologies are broadly characterized as either passive solar or active solar depending on the way they capture and distribute solar energy or convert it into solar power. Active solar techniques include the use of photovoltaic systems, concentrated solar power and solar water heating to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air. The large magnitude of solar energy available makes it a highly appealing source of electricity. The United Nations Development Programme in its 2000 World Energy Assessment found that the annual potential of solar energy was 1,575–49,837 exajoules (EJ). This is several times larger than the total world energy consumption, which was 559.8 EJ in 2012. Solar Energy is a peer-reviewed scientific journal covering research on solar energy such as photovoltaics and solar heating, but also its indirect usages like wind power or bioenergy. It is published by Elsevier on behalf of the International Solar Energy Society. The editor-in-chief is Yogi Goswami. According to the Journal Citation Reports, the journal has a 2013 impact factor of 3.541. The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury. 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 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 ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic. The Times of India | 21 Oct 2018 Independent online (SA) | 21 Oct 2018 CNN | 20 Oct 2018 BBC News | 21 Oct 2018 The Independent | 21 Oct 2018 Yahoo Daily News | 21 Oct 2018
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Naš Sunčev sustav sastoji se od Sunca i sve što putuje oko njega . To uključuje osam planeta i njihovih prirodnih satelita kao što Zemljinog mjeseca , patuljasti planeti poput Plutona i Ceres , asteroida , kometa i meteoroide Sunce jesredište našeg Sunčevog sustava . On sadrži gotovo sve mase u našem Sunčevom sustavu , a vrši ogroman teži povuci na planeta i drugih tijela . Naš Sunčev sustav oko 4,6 milijardi godina . Četiri planeta najbliža Suncu - Merkur , Venera , Zemlja i Mars - nazivaju planetima jer su čvrste, stjenovite površine . Dvije od vanjskih planeta izvan Marsove orbite - Jupiter i Saturn - poznati su kao plinoviti divovi ,daljim Uran i Neptun su pozvani ledeni divovi . Većina poznatih patuljastih planeta postoji u ledenoj zoni iza Neptuna nazvanoj Kuiperov pojas , koji je ujednoishodište za mnoge kometa . Mnogi objekti u našem Sunčevom sustavu ima atmosfere , uključujući i planeta , nekih patuljastih planeta i još par mjesecima . Naš Sunčev sustav nalazi se u Orion Arm u galaksiji Mliječni put . Tu su najvjerojatnije milijarde drugih solarnih sustava u našoj galaksiji . A tu su milijarde galaksija u svemiru . Mi mjerenje udaljenosti u našem Sunčevom sustavu astronomskih jedinica ( AU ) . Jedan AU je jednaka udaljenosti između Sunca i Zemlje , što je oko 150 milijuna KM ( 93 milijuna milja ) . NASA-in Voyager 1 twin i Voyager 2. Letjelica seprvi svemirski brod za istraživanje vanjskih dijelova Sunčevog sustava .