The Science-history of the Universe, Bindi 1Francis Rolt-Wheeler Current Literature Publishing Company, 1909 - 296 síður |
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altho amount ancients appearance assumed astronomers atmosphere attraction axis bright brilliant celestial bodies celestial sphere century chromosphere color comet constellation Copernicus corona dark determined diameter direction discovered discovery disk distance E. E. BARNARD Earth Earth's surface eclipse explain fact fixed stars Galileo gravitation heat heavens heliometer Herschel Hipparchus inferior planets instrument Jupiter Kepler known Lick Observatory light lines luminous lunar magnitude Mars mass measured Mercury meteorites meteors miles Milky minute modern Moon motion move nebulæ Neptune Newton observations Observatory orbit parallax particles path period phenomena photographic plate photosphere planet planetary planetoids pole position prism Professor Ptolemy radiation rays result revolution revolving ring rotation satellites Saturn seen showed solar system space spectra spectroheliograph spectroscope spectrum sphere spot star clusters stellar sun-spots Sun's tail telescope temperature theory tides tion transit Tycho Tycho Brahe Uranus vapor various velocity Venus visible
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Síða 297 - I looked into the spectroscope. No spectrum such as I expected! A single bright line only! At first I suspected some displacement of the prism, and that I was looking at a reflection of the illuminated slit from one of its faces. This thought was scarcely more than momentary; then the true interpretation flashed upon me. The light of the nebula was monochromatic, and so, unlike any other light I had as yet subjected to prismatic examination, could not be extended out to form a complete spectrum....
Síða 117 - As for the future, we may say, with equal certainty, that inhabitants of the earth cannot continue to enjoy the light and heat essential to their life for many million years longer unless sources now unknown to us are prepared in the great storehouse of creation.
Síða 293 - I have seen double and treble nebulae variously arranged; large ones with small, seeming attendants ; narrow, but much extended lucid nebulae or bright dashes; some of the shape of a fan, resembling an electric brush issuing from a lucid point...
Síða 295 - If this matter is self-luminous, it seems more fit to produce a star by its condensation than to depend on the star for its existence.
Síða 233 - Wherefore if according to what we have already said it should return again about the year 1758, candid posterity will not refuse to acknowledge that this was first discovered by an Englishman.
Síða 292 - In the sword of Orion are three stars quite close together. In 1656, as I chanced to be viewing the middle one of these with the telescope, instead of a single star, twelve showed themselves (a not uncommon circumstance). Three of these almost touched each other, and, with four others, shone through a nebula, so that the space around them seemed far brighter than the rest of the heavens, which was entirely clear, and appeared quite black, the effect being that of an opening in the sky, through which...
Síða 258 - This disregard is neither supercilious nor causeless. The constellations seem to have been almost purposely named and delineated to cause as much confusion and inconvenience as possible. Innumerable snakes twine through long and contorted areas of the heavens, where no memory can follow them ; bears, lions, and fishes, large and small, northern and southern, confuse all nomenclature, &c. A better system of constellations might have been a material help as an artificial memory.
Síða 63 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Síða 76 - ... vehemently suspected by this Holy Office of heresy : that is to say, that you believe and hold the false doctrine, and contrary to the Holy and Divine Scriptures, namely, that the sun is the centre of the world...
Síða 189 - That Mars is inhabited by beings of some sort or other we may consider as certain as it is uncertain what those beings may be."1 Deimos and Phobos.