Solar System

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Galaxy, Star, Solar System, Planet, Moon, Asteroid, Comet
Mercury, Venus, Earth (Moon), Mars (3D), Jupiter, Saturn, Uranus, Neptune, Pluto

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Solar System : the sun together with the group of celestial bodies that are held by its attraction and revolve around it; also : a similar system centered on another star — Webster

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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 volatiles, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic. — Wikipedia

David Darling’s Internet Encyclopedia of Science, Britannica

Introduction

A Traveler’s Guide to the Planets (National Geographic Channel)

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Solar System Exploration at 50 (NASA)

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WorldCat, Library of Congress, UPenn Online Books, Open Library

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NASA Virtual Field Trip: Solar System Math

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OER Commons: Open Educational Resources

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The Planetary Society

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Solar System Exploration, planets (NASA)
Eyes on the Solar System (JPL/NASA)

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USA.gov

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OEDILF: The Omnificent English Dictionary In Limerick Form

returntotop

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Solar System News -- ScienceDaily Solar System Planets. Astronomy articles on the eight planets, plus the two dwarf planets, Pluto and Eris. Great pictures of everything in the solar system. Updated daily.

  • Martian dust storm grows global: Curiosity...
    on June 20, 2018 at 9:09 pm

    A storm of tiny dust particles has engulfed much of Mars over the last two weeks and prompted NASA's Opportunity rover to suspend science operations. But across the planet, NASA's Curiosity rover, which has been studying Martian soil at Gale Crater, is expected to remain largely unaffected by the dust. The Martian dust storm has grown in size and is now officially a 'planet-encircling' (or 'global') dust event. […]

  • Explosive volcanoes spawned mysterious Martian...
    on June 18, 2018 at 2:25 pm

    Explosive volcanic eruptions that shot jets of hot ash, rock and gas skyward are the likely source of a mysterious Martian rock formation, a new study finds. The new finding could add to scientists' understanding of Mars's interior and its past potential for habitability, according to the study's authors. […]

  • Distant moons may harbor life
    on June 15, 2018 at 1:36 am

    Researchers have identified more than 100 giant planets that potentially host moons capable of supporting life. Their work will guide the design of future telescopes that can detect these potential moons and look for tell-tale signs of life, called biosignatures, in their atmospheres. […]

  • Long suspected theory about the moon holds water
    on June 14, 2018 at 1:50 pm

    Scientists have discovered a mineral known as moganite in a lunar meteorite found in a hot desert in northwest Africa. […]

  • The true power of the solar wind
    on June 12, 2018 at 2:57 pm

    The planets and moons of our solar system are continuously being bombarded by particles from the sun. On the Moon or on Mercury, the uppermost layer of rock is gradually eroded by the impact of sun particles. New results show that previous models of this process are incomplete. The effects of solar wind bombardment are much more drastic than previously thought. […]

  • Minerology on Mars points to a cold and icy...
    on June 8, 2018 at 4:31 am

    The climate throughout Mars' early history has long been debated -- was the Red Planet warm and wet, or cold and icy? New research published in Icarus provides evidence for the latter. […]

  • NASA finds ancient organic material, mysterious...
    on June 7, 2018 at 6:29 pm

    NASA's Curiosity rover has found new evidence preserved in rocks on Mars that suggests the planet could have supported ancient life, as well as new evidence in the Martian atmosphere that relates to the search for current life on the Red Planet. […]

  • New data-mining technique offers most-vivid...
    on June 6, 2018 at 6:37 pm

    A team of scientists have revealed the mineralogy of Mars at an unprecedented scale, which will help them understand the planet's geologic history and habitability. Understanding the mineralogy of another planet, such as Mars, allows scientists to backtrack and understand the forces that shaped their formation in that location. […]

  • Majority of Americans believe it is essential...
    on June 6, 2018 at 4:04 pm

    Roughly seven in 10 Americans (72 percent) say it is essential for the US to continue to be a world leader in space exploration. Strong public support is widely shared across gender, generational, educational and political groups. […]

  • Thank the moon for Earth's lengthening day
    on June 4, 2018 at 7:12 pm

    A new study that reconstructs the deep history of our planet's relationship to the moon shows that 1.4 billion years ago, a day on Earth lasted just over 18 hours. This is at least in part because the moon was closer and changed the way the Earth spun around its axis. […]