Solar System

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Cosma’s Solar System Gallery



Physical Realm
Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


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



Solar System and Beyond (NASA)
Solar System Exploration (NASA)
Solar System Simulator : View Anyplace from Anyplace (NASA, JPL)
Astrogeology Science Center (USGS)

Our Sun & Solar System Internet Resources (Library of Congress)
Solar System Portal (Wikipedia)


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

OneLook, Free Dictionary, Wiktionary, 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

Solar System (Eric Weisstein’s World of Astronomy, Wolfram Research)
Planets (Eric Weisstein’s World of Astronomy, Wolfram Research)
David Darling’s Internet Encyclopedia of Science, Encyclopædia Britannica
Encyclopedia of the Solar System


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

Note: These are 360° Videos — press and hold to explore!


Solar System (Wolfram Alpha)
Planets (Wolfram Alpha)


Weight on Other Planets (Online

The Planets We Don’t Have (Adam Frank, NPR)

Note: This is a 360° Video — press and hold to explore it!



Almagest (Wikipedia)
Ptolemy (Wikipedia)

Orrery (Wikipedia)

Solar System Exploration at 50 (NASA)


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



Solar System (Space Place, NASA)
Solar System Explorer (Space Place, NASA)
NASA Virtual Field Trip: Solar System Math
Our Solar System (Ask an Astronomer, Cornell University)
The Nine Planets Solar System Tour
Solar System (Cosmos4Kids)
Solar System, More than Planets (Cosmos4Kids)
Solar System II| Exploration (Cosmos4Kids)


Crash Course Astronomy (YouTube)

OER Commons: Open Educational Resources



The Planetary Society


Science Daily, NPR Archives




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





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.

  • Eclipse data illuminate mysteries of Sun's corona
    on June 5, 2020 at 8:59 pm

    Observations from total solar eclipses are used to measure the shape of the Sun's magnetic field.

  • Origin of Martian moon Phobos
    on June 3, 2020 at 2:04 pm

    New images of the Martian moon Phobos give scientists insight into the physical properties of the moon and its composition.

  • New study provides maps, ice favorability index...
    on June 1, 2020 at 5:46 pm

    A research team has created an Ice Favorability Index. The geological model explains the process for ice formation at the poles of the moon, and mapped the terrain, which includes craters that may hold ice deposits. The model, accounts for what asteroid impacts on the surface of the moon may do to deposits of ice found meters beneath the surface.

  • Astronomers create cloud atlas for hot,...
    on May 26, 2020 at 8:11 pm

    As astronomers ramp up study of the atmospheres of hot, Jupiter-like planets around other stars, they encounter clouds that obscure study of atmospheric gases. A new computer model looks at the proposals for cloud compositions -- from smog to rubies -- and finds that the most likely, over a large range of temperatures, are silicate clouds: aerosols of silicon and oxygen, like molten quartz or sand. The hottest exoplanets have clear skies; the coolest have hydrocarbon hazes.

  • ATLAS telescope discovers first-of-its-kind...
    on May 22, 2020 at 1:55 pm

    An extraordinary asteroid with comet-like features has researchers puzzled.

  • NASA's Curiosity rover finds clues to chilly...
    on May 19, 2020 at 8:58 pm

    By studying the chemical elements on Mars today -- including carbon and oxygen -- scientists can work backwards to piece together the history of a planet that once had the conditions necessary to support life.

  • Mystery of lava-like flows on Mars solved
    on May 18, 2020 at 3:16 pm

    The mystery of some lava-like flows on Mars has been solved by scientists who say they are caused not by lava but by mud. There are tens of thousands of these landforms on the Martian surface, often situated where there are massive channels scoured into the surface by ancient liquids flowing downstream. Scientists performed experiments at low pressure and at extremely cold temperatures (-20°C) to recreate the Martian environment.

  • TRAPPIST-1 planetary orbits not misaligned
    on May 14, 2020 at 3:57 pm

    Astronomers have determined that the Earth-like planets of the TRAPPIST-1 system are not significantly misaligned with the rotation of the star. This is an important result for understanding the evolution of planetary systems around very low-mass stars in general, and in particular the history of the TRAPPIST-1 planets including the ones near the habitable zone.

  • What's Mars made of?
    on May 13, 2020 at 12:17 pm

    Earth-based experiments on iron-sulfur alloys thought to comprise the core of Mars reveal details about the planet's seismic properties for the first time. This information will be compared to observations made by Martian space probes in the near future. Whether the results between experiment and observation coincide or not will either confirm existing theories about Mars' composition or call into question the story of its origin.

  • Scientists reveal solar system's oldest molecular...
    on May 11, 2020 at 7:49 pm

    Scientists have analyzed a meteorite atom by atom to reveal the chemistry and acidity of the earliest fluids in the solar system. By finding evidence of sodium-rich alkaline water in the Tagish Lake meteorite, this new study suggests amino acids could have formed rapidly on the parent asteroid, opening the door for the early evolution of microbial life.