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2. Wikipedia : Featured topics/Solar System

   en.wikipedia.org/.../Solar_System

   The Solar System is a gravitationally bound system consisting of the Sun and the celestial bodies that orbit it. After the Sun, the largest objects in the Solar system are the eight planets, consisting of the four gas and ice giants as well as the four terrestrial planets .

3. Solar System - Wikipedia

   en.wikipedia.org/wiki/Solar_System

   The Solar System remains in a relatively stable, slowly evolving state by following isolated, gravitationally bound orbits around the Sun. [28] Although the Solar System has been fairly stable for billions of years, it is technically chaotic, and may eventually be disrupted. There is a small chance that another star will pass through the Solar ...

4. Geology of solar terrestrial planets - Wikipedia

   en.wikipedia.org/wiki/Geology_of_solar...

   The Solar System is believed to have formed according to the nebular hypothesis, first proposed in 1755 by Immanuel Kant and independently formulated by Pierre-Simon Laplace. [2] This theory holds that 4.6 billion years ago the Solar System formed from the gravitational collapse of a giant molecular cloud. This initial cloud was likely several ...

5. List of Solar System objects - Wikipedia

   en.wikipedia.org/wiki/List_of_Solar_System_objects

   The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star; The inner Solar System and the terrestrial planets. Mercury. Mercury-crossing minor planets; Venus. Venus-crossing minor planets

6. Deferent and epicycle - Wikipedia

   en.wikipedia.org/wiki/Deferent_and_epicycle

   The deferent/epicycle models worked as well as they did because of the extraordinary orbital stability of the solar system. Either theory could be used today had Gottfried Wilhelm Leibniz and Isaac Newton not invented calculus. [20] According to Maimonides, the now-lost astronomical system of Ibn Bajjah in 12th century Andalusian Spain lacked ...

7. Portal:Solar System - Wikipedia

   en.wikipedia.org/wiki/Portal:Solar_System

   This is the boundary of the Solar System to interstellar space. The outermost region of the Solar System is the theorized Oort cloud, the source for long-period comets, extending to a radius of 2,000–200,000 AU. The closest star to the Solar System, Proxima Centauri, is 4.25 light-years (269,000 AU) away.