20 October
1896: On 20 October 1896, Félix Tisserand died.Tisserand was a French astronomer especially noted for his textbook Traité de mécanique céleste ('Treatise on Celestial Mechanics'). This work, an update of ...
27 ΦΕΒ. 2004
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1967: On 21 October 1967, Ejnar Hertzsprung died.
Hertzsprung was a Danish astronomer who classified types of stars by relating their surface temperature (or colour) to their absolute brightness.
A few years later Russell illustrated this relationship graphically in what is now known as the Hertzsprung-Russell diagram, which has become fundamental to the study of stellar evolution.
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19 October
1910: On 19 October 1910, Subrahmanyan Chandrasekhar was born.Chandrasekhar was an Indian-born American astrophysicist who (with William A. Fowler) won the 1983 Nobel Prize for Physics for formulating the currently ...
18 October
2000: On 18 October 2000, new solar panels for the NASA/ESA Hubble Space Telescope (HST) arrived to be tested at the European Space Agency's ESTEC facility in Noordwijk, the Netherlands. ...
17 October
2002: On 17 October 2002, ESA launched the Integral mission. Integral is the first space observatory that can simultaneously observe objects in gamma rays, X-rays, and visible light. Its principal ...
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