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An overview of the Solar System, its regions, celestial objects, structure, composition, history, exploration and lists. Learn about the Sun, planets, moons, dwarf ...
A comprehensive and updated list of the most massive and smallest objects in the Solar System, sorted by radius and mass. Includes planets, dwarf planets, moons, asteroids, comets, and trans-Neptunian objects, with graphs, notes, and references.
A planet is a large, rounded astronomical body that is neither a star nor its remnant. The nebular hypothesis is the best available theory of planet formation. See lists of planets in the Solar System and beyond, by discovery method, distribution, characteristics and more.
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
A comprehensive list of lists of celestial bodies and objects in the Solar System, the Milky Way galaxy, and beyond. Find out the nearest, brightest, largest, oldest, and most unusual astronomical objects in various categories and catalogues.
A table of the largest exoplanets discovered so far, ordered by radius and compared to Jupiter. The list includes planets, brown dwarfs, sub-brown dwarfs and rogue planets, with notes on their classification, mass, age and location.
This web page provides a table of known galaxies within 3.8 megaparsecs (12.4 million light-years) of the Solar System, in ascending order of heliocentric distance. The nearest galaxy to the Milky Way is the Large Magellanic Cloud, at a distance of 0.163 megaparsecs (0.55 light-years).
Learn about the largest stars in the Milky Way and other galaxies, measured by their radius in solar units. Compare different methods and sources of determining stellar radii, and see examples of red supergiants, luminous red novae, and supermassive stars.