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23 hours ago · Frederick Barnard (B.A. 1828), [132] [133] [134] mathematician, educator, president (1856–58) and chancellor (1858–61) of the University of Mississippi, president (1864–89) of Columbia University, posthumous namesake of Barnard College, active in the founding of the American Association for the Advancement of Science and the National Academy of Sciences
23 hours ago · Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.Their mass is approximately 13 to 80 times that of Jupiter (M J) [2] [3] —not big enough to sustain nuclear fusion of ordinary hydrogen (1 H) into helium in their cores, but massive enough to emit some light and heat from the fusion of deuterium (2 H).
