Consider the Heavens |
Contents
CHAPTER PAGE I THE AWESOME SKY I | 1 |
SIGNS AND WONDERS | 11 |
THE EARTH MOVES | 20 |
Copyright | |
12 other sections not shown
Common terms and phrases
appear assumption astronomers atmosphere atoms average binary stars body bright brighter celestial Cepheid variables classes of stars comets components compute conclusion Consequently dark density determined diameter direction distance double star earth eclipsing variable electrons enormous example existence exterior galaxies fact faint galactic giant stars globular clusters gravitation greater hundred Hyades hypothesis infinite interval Jupiter known Laplace light Light-curve light-years luminosity luminous magnitude Mars mass measured methods miles per second Milky million molecules moon motions moving nearly nebulae novae number of stars objects observations Observatory orbits Orion pair period of revolution phenomena photographic photons planetary planetary nebulae planetesimals planets Pleiades present probably properties radiant energy radiation relatively respect revolve satellites similar Sirius solar system space spectral class spectral lines spectroscope spectrum speed star clouds stellar system super-galaxies super-giant surface telescope temperature theory thousand tion unaided eye universe variable stars velocity Venus wave lengths