On this day in 1919 - November 1st - Anglo-Austrian mathematician and cosmologist Hermann Bondi was born.
Bondi was a distinguished academic, Fellow of the Royal Society, and among many positions outside academia, he served as Director-General of the European Space Research Organisation (ESRO) (1967â€“1971) (which later became the European Space Agency, ESA).
On this day in 1572 - November 6th - Tycho Brahe recorded a bright new star, supernova SN 1572) in the constellation Cassiopeia.
Tycho's study of the object showed that it wasn't a local phenomenon, but a distant star. This was completely contrary to the understanding of the time that the stars were part of sphere which was perfect and unchangeable.
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