Page:In the high heavens.djvu/387

Rh Stars,  Alpha Centauri, 208, 330 Groombridge No. 1830, 12, 208, 209, 211 binary, 15 colour problem, 152 Huggins' explanation, 153 the spectroscope, 191 in proof of universal gravitation, 201 actual and apparent propinquity, 201 movements discovered by Herschel, 202 Xi Ursæ Majoris, 202 Star-groups of a million years ago, 12, 15-18, 20 transformation of, 172 Stumpe, Prof., and the movement of the solar system, 24-25 Sun, the, of the coal measures, 17-18 voyage through space, 21-31 the direction of voyage, 21-25 velocity, 21, 26, 28, 30, 31 new method of studying the prominences, 86-87 study of the corona, 87, 92-93 nature of the corona, 164 Schuster's researches, 94 rotation of the photosphere, 93 solar atmosphere, 126 electric connection between the sun and planets, 164 velocity of sun's rotation determined by spectroscope, 166 researches of Professor Rowland, 168 solar spectrum compared with that of earth at sun-heat, 169 the Nebular Hypothesis, 226-229 theory of a central sun, 231-235 history of the sun, 242 future extinction of the sun, 243, 275 waste of solar heat, 263 the heat problem, 266-272 Helmholtz's theory, 269, 369 terrestrial elements in the sun, 300 Sun, solar explosions, 339, 344 the molecular theory and solar physics, 369

at confines of the atmosphere, 127 Terby, Dr., observations on Mars, 142 Todd, Professor David, and the Eclipse of 1893, 89

, the, is it of the same substance throughout? 206

, future pole star, 56 Velocities, critical, 132 on the sun and planets, 314 Venus in remote antiquity, 19 through the telescope, 40, 122-123 compared with Mars, 121 topography of, 123 Vogel and the voyage of the solar system, 30 his spectrum researches, 160 Volcanoes and meteorites, 333 projective energy, 334 force of primeval volcanoes, 335-337, 341 the uniformitarian hypothesis denied, 336

, other, 32, 40 the smallest world containing air and water, 134

Ursæ Majoris, 202