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accurate Albert Einstein angstroms astronomers atom band beam billion bright broadcast clouds coherent light color Descartes developed diﬂicult discovered distant stars earth Einstein electric electromagnetic spectrum electrons element energy ether exactly example explain eyes ﬁeld ﬁgures ﬁnally ﬁnd ﬁndings ﬁre ﬁrst ﬁve ﬂash ﬂowing Fraunhofer Fraunhofer lines frequency galaxies Galileo giant glass glows Hale telescope heat heavens Hooke Huygens hydrogen infrared rays instrument Isaac Newton Iupiter laser lens lenses light rays light waves lines mathematical measure ment miles per second mirror moon motion Mount Palomar Observatory move Newton object observation optical orbit ordinary passes photoelectric effect photographic plate physicist Planck planets pressure prism produced quantum radiation radio waves radiotelescope rays of light real image reﬂected reﬂecting telescope refraction Roemer scientiﬁc scientists seen solar system space speciﬁc speed of light sunís sunlight surface temperature tiny tion tube ultraviolet universe violet visible wave lengths wave theory