Cosma / Communication / Knowledge / Realm / Physical / Universe / Planetary System / Planet


Space (Science Trek, YouTube Playlist)


planet : any of the large bodies that revolve around a star — Webster   See also   OneLook


Roget’s II (, Merriam-Webster Thesaurus, Visuwords


Planet A planet is a large astronomical body that is neither a star nor a stellar remnant. At least eight planets exist in the Solar System: the terrestrial planets Mercury, Venus, Earth and Mars, and the giant planets Jupiter, Saturn, Uranus and Neptune. — Wikipedia

Planet (Encyclopædia Britannica)




Planetary science or, more rarely, planetology, is the scientific study of planets (including Earth), moons, and planetary systems and the processes that form them. It studies objects ranging in size from micrometeoroids to gas giants, aiming to determine their composition, dynamics, formation, interrelations and history. It is a strongly interdisciplinary field, originally growing from astronomy and earth science, but which now incorporates many disciplines, including planetary geology (together with geochemistry and geophysics), cosmochemistry, atmospheric science, oceanography, hydrology, theoretical planetary science, glaciology, and exoplanetology. Allied disciplines include space physics, when concerned with the effects of the Sun on the bodies of the Solar System, and astrobiology. — Wikipedia

Best of Science (YouTube Playlist)

Planetary Science (NASA/JPL)
What is a Planet? (JPL, NASA)
Planets (JPL, NASA)

What Is A Planet? (Planetary Society)

Planets (Eric Weisstein’s World of Astronomy, Wolfram Research)
Planets (Wolfram Alpha)

Exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmation of detection occurred in 1992. A different planet, initially detected in 1988, was confirmed in 2003. As of 2022, there are more than 5,000 confirmed exoplanets. — Wikipedia

The Universe, Explained (Minute Physics, YouTube Playlist)

Exoplanet Exploration Program (NASA)

Naming of Exoplanets (International Astronomical Union)
Exoplanets, Worlds Orbiting Other Stars (Planetary Society)

Extrasolar Planets (Eric Weisstein’s World of Astronomy, Wolfram Research)
Exoplanets (Wolfram Alpha)




400 years, 7,500 words: A history of planetary science (Lauren Gold, Cornell Chronicle)


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




What is a Planet? (Space Place, NASA)
What Is an Exoplanet? (Space Place, NASA)

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


Physics and Chemistry of the Terrestrial Planets (MIT)



International Astronomical Union (IAU)
Minor Planet Center (International Astronomical Union)
The Planetary Society


Planetary Science (Science News)
Exoplanets News (NASA)
Exoplanets News (Sky & Telescope)
Exoplanets (Astronomy Magazine)
Extrasolar Planets (Science Daily)
Exoplanet (Science News)
Planet (
Planet (NPR Archives)


NASA Planetary Science


Planetary Science (



Explore related posts on Cosma



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.