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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 position and size of Earth in the Solar System and the Universe, based on telescopic observations and scientific measurements. Compare Earth with other celestial bodies and structures, such as the Sun, the Moon, the Kuiper belt, and the Oort cloud.
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.
Laniakea Supercluster is the galaxy supercluster that contains the Milky Way and about 100,000 other nearby galaxies. It was defined in 2014 by a new method based on galaxy velocities and has four subparts: Virgo, Hydra–Centaurus, Great Attractor, and Antlia Wall.
Sagittarius A* is the central supermassive black hole of the Milky Way galaxy, with a mass of 4.297 million solar masses. It was imaged by the Event Horizon Telescope in 2022, confirming its status as a black hole and testing Einstein's theory of relativity.
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.
5th century BC — Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars. 4th century BC — Aristotle believes the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the world which ...
Learn about Earth, the only planet with life and liquid surface water, and its physical characteristics, atmosphere, climate, and history. Find out how Earth orbits the Sun, rotates, and interacts with other planets and space objects.
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