Heaven and Earth: A Modern Astronomy |
Contents
AN EXCURSION TO THE MOON | 50 |
THE REALM OF THE PLANETS | 74 |
ARE OTHER PLANETS INHABITED? | 99 |
Copyright | |
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Common terms and phrases
Andromeda nebula angles appear astronomers astronomical units atom axis Betelgeuse body bright brilliance calculations candle-power centimeters Cepheids circle round clusters comet constellation cosmic cosmic dust course craters curvature dark density diameter dimensions disc distance Earth eclipse Equator existence Figure firmament fixed stars giant star globular globular clusters heavenly heavens imagine infinite Jupiter kilometers known length light light-years magnitude Mars Martian mass matter measure Mercury meteor meteorites miles Milky millimeters million light-years Moon moving naked eye nebula Neptune number of stars observation observatory orbit path period Perseids planetary system planets Pole Pole-star possible Proxima Centauri quintillion radius revolution rotation round the Sun Saturn seen shining sidereal sidereal period Sirius solar system space spectrum sphere spherical spiral nebulæ star-clusters stellar surface swarm telescope temperature thousand tion to-day triangle trillion two-dimensional universe Uranus Venus visible whole Zodiac