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NGC 4414, a typical spiral galaxy
NGC 4414, a typical spiral galaxy

A galaxy is a massive system bound together by gravity that contains stars and surrounding matter, stellar remnants, interstellar matter, and dark matter, all orbiting a common center of gravity. Typical galaxies range from as few as 10 million stars up to supergiants with 100 trillion stars, but most of the mass is dark matter. The Solar System is in the Milky Way galaxy, whose nearest large neighbor, the Andromeda Galaxy, is about 750,000  parsecs (2.4 million light years) away from Earth; the two galaxies dominate the Local Group. There are probably more than 200 billion galaxies in the observable universe. Most are 1,000 to 100,000 parsecs (about 3,000 to 300,000  ly) in diameter and are often separated from their neighbors by millions of parsecs. There is evidence that supermassive black holes exist at the center of many, if not all, galaxies. The Milky Way, a spiral galaxy with a diameter of at least 26,800 parsecs (87,400 ly), has such an object at the Galactic Center. ( Full article... )

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March 2 : Fast of Esther (Judaism, 2026); Adwa Victory Day in Ethiopia, Independence Day in Texas

Poster for The Sound of Music
Poster for The Sound of Music
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