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200-inch telescope Alpha Antares appear astronomical units atmosphere atoms bodies bright star brighter brilliant Capella celestial clouds comets companion components constellation crater dark dark nebulae density diameter Dipper direction discovered discovery disk Doctor Hubble double star Earth eclipse Eros faint stars fainter galactic system galaxy gaseous giant stars globular clusters Jupiter Kepler known larger Leaflet Lick Observatory light light-years lines luminosity luminous lunar magnitude mass mean distance measured meteorites meteors miles per second Milky million miles Moon motion Mount Hamilton Mount Wilson Observatory naked eye nearest nearly Neptune novae objects observed open clusters orbit Orion Orion nebula parallax period photograph planet planetary Pleiades Pluto Polaris Pole radiation reflector revolve rings rotation satellites Saturn seen Sirius solar system space spectra spectroscopic binary spectrum speed spiral nebulae spots star clusters stellar system sun-spots Sun's surface temperature thousand tion universe velocity Venus visible