Solar System

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


These are organized by a classification scheme developed exclusively for Cosma. More…



Solar System (ScienceZine)


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

Oxford, OneLook, Free Dictionary, Wiktionary, InfoPlease, Word Reference, Urban Dictionary


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, Columbia (Infoplease)


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


WolframAlpha, DuckDuckGo



Solar System Exploration at 50 (NASA)


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



NASA Virtual Field Trip: Solar System Math
Globio Glossopedia, Solar System


OER Commons: Open Educational Resources
Open Education Consortium



The Planetary Society


Conference Alerts Worldwide (Conal)




Science Daily, NPR Archives




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





OEDILF: The Omnificent English Dictionary In Limerick Form



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.

  • Mars' oceans formed early, possibly aided by...
    on March 19, 2018 at 4:42 pm

    A new theory about how oceans and volcanoes interacted during the early history of Mars supports the idea that liquid water was once abundant and may still exist underground. Geophysicists propose that the oceans originated several hundred million years earlier than thought, as the volcanic province Tharsis formed, and that greenhouse gases enabled the oceans. The theory predicts smaller oceans, more in line with estimates of water underground and at the poles today. […]

  • Interstellar asteroid, 'Oumuamua, likely came...
    on March 19, 2018 at 4:01 pm

    New research finds that 'Oumuamua, the rocky object identified as the first confirmed interstellar asteroid, very likely came from a binary star system. […]

  • Space radiation more hazardous: Implication sfor...
    on March 15, 2018 at 3:06 pm

    It might sound like something from a science fiction plot - astronauts traveling into deep space being bombarded by cosmic rays - but radiation exposure is science fact. As future missions look to travel back to the moon or even to Mars, new research cautions that the exposure to radiation is much higher than previously thought and could have serious implications on both astronauts and satellite technology. […]

  • Jupiter's atmospheric beauty is more than skin...
    on March 15, 2018 at 1:12 pm

    In the year and a half NASA's Juno spacecraft has been orbiting Jupiter, the scientists have discovered that the orange and white bands that characterize Jupiter's outer atmosphere extend thousands of miles into the gas giant's atmosphere. […]

  • NASA Juno finds Jupiter's jet-streams are...
    on March 7, 2018 at 11:34 pm

    Data collected by NASA's Juno mission to Jupiter indicate that the atmospheric winds of the gas-giant planet run deep into its atmosphere and last longer than similar atmospheric processes found here on Earth. […]

  • Hubble observes exoplanet atmosphere in more...
    on March 1, 2018 at 7:41 pm

    An international team of scientists has used the NASA/ESA Hubble Space Telescope to study the atmosphere of the hot exoplanet WASP-39b. By combining this new data with older data they created the most complete study yet of an exoplanet atmosphere. The atmospheric composition of WASP-39b hints that the formation processes of exoplanets can be very different from those of our own Solar System giants. […]

  • Mineralogy of potential lunar exploration site
    on February 28, 2018 at 8:30 pm

    Scientists have long wanted to retrieve rock samples from the Moon's South Pole-Aitken basin, and a new study could be helpful in locating an ideal landing site. […]

  • The moon formed inside a vaporized Earth synestia
    on February 28, 2018 at 3:32 pm

    A new explanation for the Moon's origin has it forming inside the Earth when our planet was a seething, spinning cloud of vaporized rock, called a synestia. The new model resolves several problems in lunar formation. […]

  • The ideal settlement site on Mars? Hotspots, if...
    on February 27, 2018 at 2:47 pm

    Selecting the perfect landing site will be essential for the successful establishment of the first Mars colony. Growing food crops will be one of the key tasks for the astronauts. Scientists have identified places on Mars that are favorable for plant species to grow. […]

  • Model based on hydrothermal sources evaluate...
    on February 23, 2018 at 5:23 pm

    Scientists compare primitive Earth scenario with satellite Europa's conditions; the Jupiterian moon could host microorganisms at the bottom of a huge warm ocean located underneath its frozen crust. […]