Eclipsing binary star diagrams, 19th-century popular science journal page. The diagrams show the eclipsing of the variable star Algol by an orbiting s

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Eclipsing binary star diagrams, 19th-century popular science journal page. The diagrams show the eclipsing of the variable star Algol by an orbiting satellite. This theory to explain the variability in the brightness of the star was proved correct by spectroscopic observations made in 1889. These proved that a second star orbiting Algol caused the periodic changes in brightness. Artwork from the 15th volume (first period of 1895) of the French popular science weekly 'La Science Illustree'.

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Photo credit: © Science Photo Library / Alamy / Afripics
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