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Learn about the Sun and the objects that orbit it, including the eight planets, the nine dwarf planets, and the small bodies such as asteroids, comets, and moons. Explore the formation, evolution, and features of the Solar System and its place in the Milky Way galaxy.
An overview of the Solar System, its regions, celestial objects, structure, composition, history, exploration and lists. Learn about the Sun, planets, moons, dwarf ...
Learn about the history and types of solar system models, especially mechanical models called orreries, that illustrate the relative positions and motions of the planets and moons. Compare different permanent and temporary orreries and scale models around the world.
Mercury is the smallest and innermost planet in the Solar System, with a highly elliptical orbit and a large iron core. Learn about its physical characteristics, orbit, rotation, surface features, history of observation, and more from this comprehensive article.
Antikythera mechanism, main fragment, c. 205 to 87 BC Carlo G Croce, reconstruction of Dondi's Astrarium, originally built between 1348 and 1364 in Padua. The Antikythera mechanism, discovered in 1901 in a wreck off the Greek island of Antikythera in the Mediterranean Sea, exhibited the diurnal motions of the Sun, Moon, and the five planets known to the ancient Greeks.
Learn how different cultures and civilizations throughout history imagined and represented the Solar System, from prehistoric times to modern astronomy. Explore the various theories, symbols, and observations of the Sun, Moon, planets, and stars.
Learn about the 300+ moons of the Solar System's planets and dwarf planets, their names, sizes, orbits and features. Compare the regular and irregular moons, the largest and smallest, the round and non-round ones, and the rings of Saturn.
The nebular hypothesis is the most widely accepted model of planetary formation, based on the idea that the Solar System was formed by the gravitational collapse of a giant molecular cloud. Learn about its history, challenges, and variations, as well as other hypotheses such as the tidal hypothesis and the vortex model.
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