Citations:brightnesses


 * 1869 Norman Lockyer, Nature, page 515
 * Racine's distance is based on a comparison of globular cluster brightnesses in M87 with those in M31 and the Galaxy. Because the Galaxy is deficient in ...
 * 1976 Donald Goldsmith, The Universe, page 139
 * Hence quasars must be billions of parsecs away, and must have much greater true brightnesses than galaxies do to be so easily observable on Earth.
 * 1997 Gerald North, Advanced Amateur Astronomy, page 293
 * The yellow filter is necessary to unify the colour of the bulb (the artificial star) and the star, in order to compare their brightnesses.
 * 2007 Nathaniel Doane, Diffuse Hot Gas in Nearby Face-on Spiral Galaxies, page 80
 * Surface Brightnesses (0.4-2.0 keV) for Three Galaxies Note. — All surface brightnesses given in units of 10 " ergs s" cm"3 arcsec"2. ...