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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.
Hypervelocity stars are stars that escape from the Milky Way due to gravitational encounters with the supermassive black hole at the Galactic Center. Stellar kinematics is the observational study of the motions of stars and galaxies, and can identify these exotic phenomena.
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 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 about the history and types of solar system models, especially mechanical models called orreries, that illustrate the relative positions and motions of the planets and moons. Compare different permanent and temporary orreries and scale models around the world.
An overview of the Solar System, its regions, celestial objects, structure, composition, history, exploration and lists. Learn about the Sun, planets, moons, dwarf ...
The path-line is the combined motion of the planet's orbit (deferent) around Earth and within the orbit itself (epicycle). Around 210 BCE, Apollonius of Perga shows the equivalence of two descriptions of the apparent retrograde planet motions (assuming the geocentric model), one using eccentrics and another deferent and epicycles . [ 43 ]
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.