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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.
Learn about different coordinate systems used in astronomy to specify positions of celestial objects relative to various reference frames. The equatorial system is based on Earth's equator and the celestial poles, and is the normal coordinate system for most star maps.
The motion of nearly 1.3 billion stars has been recorded as well as the location and brightness of 1.7 billion. ... visualizations of what the Milky Way looks like. The image you see above ( full ...
Learn how different cultures and civilizations throughout history imagined and represented the Solar System, from prehistoric times to modern astronomy. Explore the various theories, symbols, and observations of the Sun, Moon, planets, and stars.
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.
An overview of the Solar System, its regions, celestial objects, structure, composition, history, exploration and lists. Learn about the Sun, planets, moons, dwarf ...
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.