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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.
The Local Group is the galaxy group that includes the Milky Way, where Earth is located. It has a diameter of 10 million light-years and a mass of 2 × 10 12 solar masses, and consists of two collections of galaxies in a "dumbbell" shape.
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.
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.
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.
Solar physics – Sun and its interaction with the remainder of the Solar System and interstellar space. Planetary Science – study of planets, moons, and planetary systems. Atmospheric science – study of atmospheres and weather. Exoplanetology – various planets outside of the Solar System
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.