Sun is in a galaxy {Milky Way galaxy}.
properties
Diameter is 100,000 light-years, 10^29 meters. Thickness is 3000 light-years. Mass is 10^44 grams. Speed is 60 km/s toward Hydra constellation, where mass of 10^49 grams at 2.5 x 10^8 light-years causes this motion.
properties: shape
Barred-spiral disk has two large arms, Sagittarius and Perseus.
properties: age
Age is 12,000,000,000 years.
stars
Galaxy has 10^11 stars and 10^8 stars with planets. Inner stars revolve faster. Dozens of absorbed satellite galaxies cause galaxy star layers.
stars: cluster
300 groups {open cluster}, of 1000 stars each, with diameter 10 light-years, have many young, blue-white stars.
neighbors
Near galaxy are two irregularly shaped galaxies of 10^9 stars each, Large Magellanic Cloud and Small Magellanic Cloud. Eleven satellite galaxies include Sagittarius dwarf galaxy, opposite Sun on other galaxy side.
Physical Sciences>Astronomy>Galaxy
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Date Modified: 2022.0224