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Results tagged with galaxies
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user 1512
Galaxies are gravitationally bound systems of stars, interstellar gas and dark matter, often hosting a central supermassive black hole. For questions about the structure, composition, dynamics, classification, etc. of galaxies. This includes small systems of interacting galaxies (i.e. merger, or galaxy + satellite system), but for galaxy groups and clusters use [galaxy-clusters], and for questions specific to our own Milky Way galaxy use [milky-way].
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What frame(s) of reference are used to measure the rotation of the Sun around the galaxy ?
The Wikipedia page on Sun gives these three velocities,
~220 km/s (orbit around the center of the Galaxy)
~20 km/s (relative to average velocity of other stars in stellar neighbourhood)
~370 km/s(re …
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