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  2. Absolute magnitude - Wikipedia

    en.wikipedia.org/wiki/Absolute_magnitude

    For example, the giant elliptical galaxy M87 has an absolute magnitude of −22 (i.e. as bright as about 60,000 stars of magnitude −10). Some active galactic nuclei ( quasars like CTA-102 ) can reach absolute magnitudes in excess of −32, making them the most luminous persistent objects in the observable universe, although these objects can ...

  3. Magnitude (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Magnitude_(astronomy)

    Betelgeuse (apparent magnitude 0.5, absolute magnitude −5.8) appears slightly dimmer in the sky than Alpha Centauri A (apparent magnitude 0.0, absolute magnitude 4.4) even though it emits thousands of times more light, because Betelgeuse is much farther away.

  4. Sun - Wikipedia

    en.wikipedia.org/wiki/Sun

    It has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. [27] [28] It is more massive than 95% of the stars within 7 pc (23 ly). [29] The Sun is a Population I, or heavy-element-rich, [b] star. [30]

  5. People Spotted 30 Astonishingly Big Things And Shared Them ...

    www.aol.com/70-absolute-units-impressed-internet...

    The absolute unit meme is, well, an absolute unit. It is hugely popular. It’s also an example of how one simple phrase can quickly entrench itself into internet culture with a bit of luck and ...

  6. Apparent magnitude - Wikipedia

    en.wikipedia.org/wiki/Apparent_magnitude

    The absolute magnitude M, of a star or astronomical object is defined as the apparent magnitude it would have as seen from a distance of 10 parsecs (33 ly). The absolute magnitude of the Sun is 4.83 in the V band (visual), 4.68 in the Gaia satellite's G band (green) and 5.48 in the B band (blue). [20] [21] [22]

  7. Supergiant - Wikipedia

    en.wikipedia.org/wiki/Supergiant

    All supergiants are larger and more luminous than main sequence stars of the same temperature. This means that hot supergiants lie on a relatively narrow band above bright main sequence stars. A B0 main sequence star has an absolute magnitude of about −5, meaning that all B0 supergiants are significantly brighter than absolute magnitude −5.

  8. Andromeda Galaxy - Wikipedia

    en.wikipedia.org/wiki/Andromeda_Galaxy

    Knowing the sizes and temperatures of the stars, they were able to measure their absolute magnitude. When the visual and absolute magnitudes are known, the distance to the star can be calculated. The stars lie at a distance of 2.52 ± 0.14 million ly (159.4 ± 8.9 billion AU) and the whole Andromeda Galaxy at about 2.5 million ly (160 billion ...

  9. Quasar - Wikipedia

    en.wikipedia.org/wiki/Quasar

    The hyperluminous quasar APM 08279+5255 was, when discovered in 1998, given an absolute magnitude of −32.2. High-resolution imaging with the Hubble Space Telescope and the 10 m Keck Telescope revealed that this system is gravitationally lensed. A study of the gravitational lensing of this system suggests that the light emitted has been ...