Introductory astronomy |
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Contents
The Beginnings of AstronomyPtolemy | 1 |
The Earth and Its Motions | 25 |
The Earths Interior | 43 |
Copyright | |
14 other sections not shown
Common terms and phrases
absolute magnitude absorption lines angle apparent magnitude appear astronomers atoms average axis binary body bright line brighter cepheids clouds color comet constellation craters density diagram diameter direction disc distance distance modulus dust earth earth's atmosphere earth's orbit earth's surface eclipse electrons emission energy epicycle fainter galactic center galactic clusters galaxy globular clusters gravitational Hale Observatories hydrogen increase infrared interstellar ionized Jupiter layer light light-years luminosity lunar main sequence Mars mass measured meridian meteor meteorite meteoroids miles million molecules moon moon's motion moving nebula neutron nucleus object observed orbital eccentricity orbital velocity P-waves particles period photograph planet protons protoplanets quasars radial velocity radiation radio rays region result revolving rock rotation satellite Section seen semimajor axis shown in Figure solar system space spectral spectroscopic spectrum speed star star's stellar sun's sunspot surface temperature telescope theory tion Venus wavelength waves white dwarf ZAMS