"Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant" | "The Hubble Space Telescope Quasar Absorption Line Key Project |
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Astronomy and Astrophysics Letters 379 2 : L44—L47 | The Night Sky Observer's Guide, Volume 1 |
"A Relationship between Nuclear Black Hole Mass and Galaxy Velocity Dispersion".
20"Advanced Technology Large-Aperture Space Telescope ATLAST : A Technology Roadmap For The Next Decade", 2009, M | Wall, Mike December 12, 2012 |
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US National Academy of Sciences | "A Fundamental Relationship between Supermassive Black Holes and their Host Galaxies" |
"Low-Luminosity and Obscured Seyfert Nuclei in Nearby Galaxies" | |
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The Astrophysical Journal 540 1 : 45—56 | , , MacTutor History of Mathematics archive, University of St Andrews |
It is about 25,000 light-years from the center of the galaxy, and it revolves around the galactic center once about every 250 million years.
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