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Motion in the Heavens
Light and Telescopes
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appear asteroids astronomers atmosphere atoms axis big bang billion binary black hole bright called celestial Cepheids Chapter clouds clusters collisions comets cool core corona craters crust cycle density detect diameter disk distance earth electrons elliptical emit energy Figure formed galaxy Galileo gas and dust giant giant stars gravity H-R diagram helium hydrogen infrared ionized Jupiter layers light lines located luminosity lunar magnetic field magnitude main sequence main-sequence stars mass massive stars measure meteorites Milky moon moon's motion move neutron star nuclear nucleus object observations orbit parallax particles percent photons photosphere planetary planetesimals planets produce pulsar quasars radiation red shift region ring rotation satellites Sky and Telescope solar eclipse solar nebula solar system space spectra spectroscopic binary spectrum spiral arms star formation star's stellar sun's sunspot supernova surface temperature theory tion ultraviolet universe velocity Venus visible wavelengths waves white dwarf x-ray