Man's Place in the Universe: Changing Concepts

3.3 mm NRAO 90-inch reflector Andromeda Nebula angstroms astronomers astrophysicists basic Big-Bang billion light biological century cm NRAO 140-foot Coperni Copernican revolution Copernicus Copernicus's copy cosmic dust cosmology Courtesy dark nebulae Darwin death-awareness degrees Kelvin diagram discovery dust clouds emission nebula evidence evolutionary geologists geology globular clusters globules Hale Observatories Harlow Shapley heaven heliocentric Hubble Hubble's human Humason hydrogen hypothesis infrared interstellar medium interstellar molecules Kapteyn Kitt Peak KM/SEC Lyell Lyellian major measured ments Milky Way system modern science molecular motion Mount Wilson NRAO 36-foot observed original Owen Gingerich parsecs photograph planets present probably protostar quasars radial velocities radiation Radio Astronomy radio telescope redshift reflector of Steward Reinhold Revolutionibus Rheticus Riecker Sagittarius scientific Shapley's solar system species spectrum spheres spiral arms spiral nebulae stellar Steward Observatory theory tion Tycho ultraviolet universe of galaxies variable stars velocities of recession wavelength Wilson 100-inch world view young stars