AstronomyJ. Wiley & sons, Incorporated, 1940 - 205 pagina's |
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Pagina 84
... tail . On the other hand , many comets do not have appreciable tails . Such comets closely resemble nebulae , but can be distinguished from them by their motion through the sky . In nearly all cases a comet is observed only in that part ...
... tail . On the other hand , many comets do not have appreciable tails . Such comets closely resemble nebulae , but can be distinguished from them by their motion through the sky . In nearly all cases a comet is observed only in that part ...
Pagina 85
... tail . The Earth also passed through the tail of a comet on June 30 , 1861 , with no certain observable effect . Levett Bradley FIG . 34. The tail of a comet always points away from the Sun. Comets sometimes develop secondary tails ...
... tail . The Earth also passed through the tail of a comet on June 30 , 1861 , with no certain observable effect . Levett Bradley FIG . 34. The tail of a comet always points away from the Sun. Comets sometimes develop secondary tails ...
Pagina 89
... tails of some comets show clearly that the material of the tail is flowing away from the head . It is evident that this material is being lost , that the mass of the comet is becoming smaller by this wasting away . COMETS AND METEOR ...
... tails of some comets show clearly that the material of the tail is flowing away from the head . It is evident that this material is being lost , that the mass of the comet is becoming smaller by this wasting away . COMETS AND METEOR ...
Inhoudsopgave
CHAPTER PAGE | 1 |
ASTRONOMICAL INSTRUMENTS | 98 |
THE STARS | 117 |
Copyright | |
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Algol Alpha ancient Andromeda appear asteroids astronomers atmosphere axis beautiful believed Betelgeuse Bradley FIG bright stars brighter brightest star brilliance celestial equator celestial sphere circle clouds color comet composed constellation craters Cygnus dark diffuse nebulae disc discovered distance double star Earth equinox faint full moon galactic Galileo globular clusters gravitational group of stars heavenly bodies horizon instrument interesting Jupiter known latitude Levett Bradley light light-years magnitude Mars mass measured Mercury meteorite meteors Milky Way Galaxy million Moon's orbit motion Mount Wilson Observatory moving naked eye nearly nebular theory night North Pole Northern object observer open clusters Orion passing path period phase photographs planetary nebulae planetesimals planets Pleiades position probably reflecting telescope reflector refracting revolve rotation satellites Saturn seen shines side solar system spectra spectroscope spectrum spiral Sun's Sunspots surface tail temperature tion total eclipse variable stars Venus visible Yerkes Observatory zodiac