Solar System

Cosma / Communication / Knowledge / Realm / Physical / Universe / Solar System, Our Neighborhood


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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 — Merriam-Webster   See also   OneLook


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 (Encyclopædia Britannica)



Solar Extremes

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Explore related posts on Cosma



Talks about the Solar System (TED: Ideas Worth Spreading)
Articles about the Solar System (Big Think)




Solar System and Beyond (NASA)
Solar System Exploration (NASA Science)
Our Solar System (NASA Science)
Solar System (NASA Science)

Age and Origin of the Solar System (Introduction to Astronomy, Wolfgang H. Berger, UC San Diego)
Our Solar System (Lunar & Planetary Institute)
Evolution of our Solar System (Lunar & Planetary Institute)

Solar System (Eric Weisstein’s World of Astronomy, Wolfram Research)
Solar System Formation (Eric Weisstein’s World of Astronomy, Wolfram Research)

Solar System (Wolfram Alpha)




History of the Solar System (Astronomiae Historia: History of Astronomy)


DDC: 523.2 Solar System (Library Thing)
Subject: Solar System (Library Thing)

Subject: Solar System (Open Library)

LCC: QB 500.5 Solar System (UPenn Online Books)

LCC: QB 500.5 Solar System (Library of Congress)
Subject: Solar System (Library of Congress)

Subject: Solar System (WorldCat)




Solar System (Space Place, NASA)
Solar System (United States Geological Survey)

Solar System I (Cosmos4Kids)
Solar System II (Cosmos4Kids)

Solar System (Astronomy Center, ComPADRE)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



The Planetary Society
Lunar & Planetary Institute


Solar System (JSTOR)
Solar System (NASA Science)
Solar System News (Sky & Telescope)
Solar System (Science Daily)
Solar System (
Solar System (NPR Archives)



Solar System (



Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
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


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.