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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.
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 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.
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.
The Sagan Planet Walk has inspired the creation of other scale-model Solar Systems in the United States. The Delmar Loop Planet Walk in St. Louis, Missouri: "In 2006, I became aware of the Sagan Planet Walk in Ithaca, NY, and as an amateur astronomy buff, I found the idea of a scale model solar system to be a fascinating concept.
Learn how the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud about 4.6 billion years ago, and how it has evolved since then. Explore the history, evidence, and challenges of the nebular hypothesis, and the fate of the Sun and its planets.
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.
A web page that lists different lengths in orders of magnitude, from the size of the universe to the diameter of a proton. It does not answer the query directly, but provides some examples of lengths smaller than a millimeter, such as nanometers and micrometers.
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