The Solar System

Solar System

The Solar System consists of the Sun and those celestial objects bound to it by gravity. These objects are the eight planets, their 166 known moons, five dwarf planets, and billions of small bodies. The…

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Stellar Magnitude

stellar magnitude

In 2nd century BC Hipparchus compiled a catalog of stars. Based on this catalog Ptolemy introduced a system of assigning Stellar Magnitude to each star “a number” depending on its brightness. Ptolemy suggested ‘1’ for…

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