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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.
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.
Andromeda Galaxy is the nearest major galaxy to the Milky Way, located in the constellation of Andromeda. It is a barred spiral galaxy with a diameter of about 152,000 light-years and a mass of 1 trillion solar masses.
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.
Betelgeuse is a red supergiant star in the constellation of Orion, with a variable apparent magnitude ranging from +0.0 to +1.6. It is the brightest star in the night sky at near-infrared wavelengths and will likely explode as a supernova in the future.
Sirius is a binary star system with a main-sequence star and a white dwarf companion. It is 2.64 parsecs away from Earth and has a visual apparent magnitude of −1.46, making it the brightest star in the night sky.
TON 618 (abbreviation of Tonantzintla 618) is a hyperluminous, broad-absorption-line, radio-loud quasar and Lyman-alpha blob [2] located near the border of the constellations Canes Venatici and Coma Berenices, with the projected comoving distance of approximately 18.2 billion light-years from Earth.
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.