I Can't Sleep Podcast Episode 391: Galaxy (Remastered)
Galaxy (Remastered)
Even sleep has a center of gravity. Galaxies, those sprawling cosmic suburbs of stars and dust, come in convenient spiral, elliptical, and irregular shapes. They’re big, old, and mostly indifferent—perfect for a little insomnia relief.
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This content is derived from the Wikipedia article on Galaxy, available under the Creative Commons Attribution-ShareAlike (CC BY-SA) license. Read the full article: Wikipedia - Galaxy.
“A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. The word is derived from the Greek galaxias (γαλαξίας), literally ‘milky’, a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a thousand stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy’s centre of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few per cent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies.”
