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IntroductionThe Study of Astronomy
Exploring the Sky
PLATE PAGE I The Milky Way in the neighbourhood of the Southern Cross
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a-particle amount appear astronomical atomic number average binary stars binary system body bullet candle-power Cepheid variables charge collisions colours components condensations degrees density diameter displacements distance earth electric electrons ellipse emitted energy of motion equal equipartition of energy ergs estimate galactic system gaseous globular clusters gravitational pull helium hydrogen atom hypothesis inch known Kruger 60 light and heat light-years luminosity main-sequence miles a second million million millions of millions molecules move nearest nucleus number of stars observed orbits particles physical planets Plaskett's star precisely present primaeval protons Proxima Centauri quantum radio-active rotation round the sun Saturn shewn in Plate Sirius solar system specks of dust spectra spectral type spectroscopic binaries spectrum speed star's stellar structure substance sun's weight supposed surface telescope temperature theory thousands of millions tion total number universe uranium velocities Waterloo Station wave-length white dwarfs whole of space y-rays