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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 what the celestial poles are, how they relate to Earth's axis of rotation and the celestial sphere, and how they change over time. Find out how to locate the north and south celestial poles from the stars and constellations.
Learn about the ecliptic coordinate system, a celestial coordinate system used for representing the positions and orbits of Solar System objects. Find out how to measure ecliptic longitude, latitude, and distance, and how to specify the equinox of a particular date.
The huge map has already helped changed our view of the galaxy in unexpected ways, according to its creators. In all, it catalogues more than 1.5 billion objects, a vast improvement on previous ...
The ecliptic is the orbital plane of Earth around the Sun and the apparent path of the Sun on the celestial sphere. The obliquity of the ecliptic is the angle between the ecliptic and the celestial equator, which is about 23.4° and varies over time due to precession and nutation.
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 ...
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 galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies. Learn about the definition, position and examples of the galactic plane of the Milky Way and other galaxies.