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The Milky Way is the galaxy that includes the Solar System, with a hazy band of light seen in the night sky. It is a barred spiral galaxy with a supermassive black hole at its center, and contains 100–400 billion stars and planets.
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.
The night sky is not completely dark, even in the absence of moonlight and city lights, due to various sources of light such as airglow, scattering, and artificial pollution. Learn how the brightness of the sky varies over the day and night, and how it affects the visibility and appearance of celestial objects like stars, planets, and the Moon.
Orion Arm is a minor spiral arm in the Milky Way Galaxy that contains the Solar System and many bright stars and nebulae. Learn about its location, composition, form, and Messier objects in this comprehensive article.
The Galactic Center is the barycenter of the Milky Way and a corresponding point on the rotational axis of the galaxy. It contains a supermassive black hole of about 4 million solar masses, called Sagittarius A*, which is a compact radio source near the galactic rotational center.
Starlight is the light emitted by stars other than the Sun, observable from Earth at night. Learn about the history, measurement, and properties of starlight, such as its color, spectra, and polarization.
Galactic astronomy is the study of the Milky Way galaxy and all its contents, in contrast to extragalactic astronomy. Learn about the subcategories, topics, and methods of galactic astronomy, as well as its history and applications.
In astronomy, galactocentrism is the theory that the Milky Way Galaxy, home of Earth ' s Solar System, is at or near the center of the Universe. [1] [2]Thomas Wright and Immanuel Kant first speculated that fuzzy patches of light called nebulae were actually distant "island universes" consisting of many stellar systems. [3]
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