Frontiers of AstronomyThis is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. |
Contents
ODDITIES ABOUT THE EARTH I | 1 |
THE WORKING EARTH | 18 |
THE TAP ROOT | 40 |
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Andromeda Nebula argument astronomers become blue giants brighter brightness cent centimetre centre Cepheids chapter clusters of galaxies collisions condensation contain core corona cosmic rays craters discussion disk distance dust Earth electrons elements elliptical galaxies emitted energy evolution evolutionary track expansion explosion globular clusters gravitational H-R diagram happens heating helium Hubble's constant hydrogen important initially inside interstellar gas iron isotope kilometres per second liquid magnetic field main-sequence mass material million degrees million million million parsecs molecules Moon motions neutrons nucleus observed occur origin oscillation outer outwards oxygen Palomar Observatories parsecs particles photosphere possess possible present problem produced protons R R Lyrae stars radiation radio-waves rock rotation satellites sequence shown in Fig shown in Plate shrinkage solar atmosphere space speed spiral arms steady-state theory supernova Surface temperature tion Type II stars ultra-violet Universe uranium Venus visible light wavelength white dwarf Wilson and Palomar zone