For example, when Ernst Öpik estimated the density of a number of visual binary stars in 1916, he found that 40 Eridani B had a density of over 25,000 times the Sun's, which was so high that he called it "impossible".
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French philosopher and mathematician René Descartes was the first to propose a model for the origin of the solar system in his Le Monde (ou Traité de lumière) which he wrote in 1662 and 1663 and for which he delayed publication because of the Inquisition and it was published only after his decease in 1664.
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