19 November
1918: On 19 November 1918, Hendrik Christoffel van de Hulst was born.Van de Hulst was a Dutch astronomer who predicted theoretically that 21-centimetre radio waves were produced by interstellar hydrogen ...
27 FEB. 2004
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1889: On 20 November 1889, Edwin Powell Hubble was born.
Hubble was an American astronomer who is considered the founder of extragalactic astronomy and who provided the first evidence of the expansion of the Universe.
In 1923-5, he identified Cepheid variables in 'spiral nebulae' M31 and M33 and proved conclusively that they are outside the Milky Way. His investigation of these objects, which he called extragalactic nebulae and which astronomers today call galaxies, led to his now-standard classification system of elliptical, spiral and irregular galaxies, and proved that they are distributed uniformly out to great distances.
Hubble measured distances to galaxies and their red shifts, and in 1929 he published the velocity-distance relation which is the basis of modern cosmology.
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18 November
1923: On 18 November 1923, Alan Shepard, Jr. was born.Shepard was America's first man in space and one of only twelve humans who walked on the Moon. Named as one ...
17 November
1995: On 17 November 1995, ESA's ISO mission was launched by an Ariane 44P launcher from Europe's spaceport in Kourou, French Guiana.Probing the cool and hidden Universe, the Infrared Space ...
16 November
1973: On 16 November 1973, Skylab III was launched from Cape Canaveral, USA.It was an 84-day mission that remained the longest American spaceflight for over two decades (until Norm Thagard ...
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