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 (ScienceZine)

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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

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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.

  • Earth mini-moons: Potential for exciting...
    on August 13, 2018 at 2:42 pm

    The detection of 'mini-moons' -- small asteroids temporarily captured in orbit around Earth -- will vastly improve our scientific understanding of asteroids and the Earth-moon system. Small and fast-moving, they have evaded detection by existing technology, with only one confirmed mini-moon discovery to date. The advent of the Large Synoptic Survey Telescope could verify their existence and track their paths around our planet, presenting exciting scientific and commercial opportunities. […]

  • Parker Solar Probe launches on historic journey...
    on August 12, 2018 at 10:50 am

    Hours before the rise of the very star it will study, NASA's Parker Solar Probe launched from Florida Sunday to begin its journey to the Sun, where it will undertake a landmark mission. The spacecraft will transmit its first science observations in December, beginning a revolution in our understanding of the star that makes life on Earth possible. […]

  • Million fold increase in the power of waves near...
    on August 7, 2018 at 1:51 pm

    Chorus waves are electromagnetic waves. Converted to sound they sound like singing and chirping birds at dawn. They can cause polar lights above the Earth as well as damage to satellites. Now, a team of researchers has found that such waves are intensified million-fold around Jupiter's moon Ganymede. This study provides important observational constraints for theoretical studies. […]

  • Largest haul of extrasolar planets
    on August 7, 2018 at 1:51 pm

    Forty-four planets in planetary systems beyond our own have been unveiled in one go, dwarfing the usual number of confirmations from extrasolar surveys, which is typically a dozen or less. The findings will improve our models of planetary systems and may help researchers investigate exoplanet atmospheres. Novel techniques developed to validate the find could hugely accelerate the confirmation of more extrasolar planet candidates. […]

  • Organic makeup of ancient meteorites sheds light...
    on August 6, 2018 at 7:20 pm

    The origin of organic matter found in meteorites that formed during the birth of the Solar System 4.5 billion years ago may provide key clues to understanding the birth of life here on Earth. It could also help astronomers investigate the potential habitability of other solar systems. […]

  • NASA's Planet-hunting TESS catches a comet before...
    on August 6, 2018 at 2:59 pm

    Before NASA's Transiting Exoplanet Survey Satellite (TESS) started science operations on July 25, 2018, the planet hunter sent back a stunning sequence of serendipitous images showing the motion of a comet. […]

  • Oldest-ever igneous meteorite contains clues to...
    on August 6, 2018 at 1:52 pm

    Scientists believe the solar system was formed some 4.6 billion years ago when a cloud of gas and dust collapsed under gravity possibly triggered by a cataclysmic explosion from a nearby massive star or supernova. As this cloud collapsed, it formed a spinning disk with the sun in the center. Since then scientists have been able to establish the formation of the solar system piece by piece. […]

  • VLA detects possible extrasolar planetary-mass...
    on August 3, 2018 at 2:33 pm

    Astronomers have detected a possible planetary-mass object with a surprisingly powerful magnetic field some 20 light-years from Earth. It can help scientists better understand magnetic processes on stars and planets. […]

  • Astronomers assemble 'light-fingerprints' to...
    on July 31, 2018 at 2:42 pm

    Earthbound detectives rely on fingerprints to solve their cases; now astronomers can do the same, using 'light-fingerprints' instead of skin grooves to uncover the mysteries of exoplanets. […]

  • Parker Solar Probe and the birth of the solar wind
    on July 30, 2018 at 5:29 pm

    This summer, humanity embarks on its first mission to touch the Sun: A spacecraft will be launched into the Sun's outer atmosphere. Facing several-million-degree Fahrenheit temperatures, NASA's Parker Solar Probe will directly sample solar particles and magnetic fields to resolve some of the most important questions in solar science. […]