Introductory Astronomy |
Contents
The Beginnings of AstronomyPtolemy | 1 |
The Earth and Its Motions | 25 |
The Earths Interior | 43 |
Copyright | |
18 other sections not shown
Common terms and phrases
absolute magnitude absorption lines apparent magnitude appear asteroids astronomers atoms average axis binary bright line brighter celestial cepheids clouds color comet craters curve decreases density diagram diameter disc distance distance modulus dust E₁ earth earth's atmosphere earth's orbit eclipse electron emission emit energy fainter galactic center galactic clusters galactic plane galaxy gases globular clusters gravitational Hale Observatories helium hydrogen increase infrared interstellar ionized Jupiter layer light light-years luminosity lunar main sequence Mars measured meteorite meteoroids meteors miles million molecules moon moon's moving nebula neutron nucleus object observed orbital eccentricity orbital velocity particles period photograph planet protons protoplanets quasars radial velocity radiation radio rays region result rotation satellites Section seen shown in Figure solar masses solar system space spectral spectroscopic spectrum speed spiral star star's stellar sun's sunspot surface temperature telescope theory tion ultraviolet universe Venus wavelength waves white dwarf ZAMS