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The Milky Way is the galaxy that includes the Solar System, with a diameter of 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years ). It is a barred spiral galaxy with a supermassive black hole at its center and many satellite galaxies.
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.
A galactic quadrant is one of four circular sectors in the division of the Milky Way Galaxy. The Delta Quadrant is one of the four quadrants in the Star Trek universe, based on a meridian that runs through the galactic center.
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.
Thomas Wright (1711-1786) was an English astronomer who described the shape of the Milky Way and suggested that nebulæ were distant galaxies. He also designed gardens and buildings for wealthy patrons and wrote about the universe and eternity.
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.
Soon after, it was proposed as a distinct galactic structure in the Milky Way, different from the thin disk and the halo in the 1983 article by Gilmore & Reid. [2] It is supposed to dominate the stellar number density between 1 and 5 kiloparsecs (3.3 and 16.3 kly ) above the galactic plane [ 2 ] and, in the solar neighborhood , is composed ...
The KBC Void (or Local Hole) is a large, empty region of space that contains the Milky Way and the Laniakea Supercluster. It is debated whether it is consistent with the ΛCDM model and whether it affects the measurement of the Hubble constant.