Events
1977 - Voyager program: Voyager 1 is launched
1984 - STS-41-D: The Space Shuttle Discovery lands after its maiden voyage.
Births
1787 - François Sulpice Beudant, French mineralogist and geologist
1792 - Pierre-Armand Dufrénoy, French geologist and mineralogist
1857 - Konstantin Tsiolkovsky, Russian rocket scientist and inventor
Deaths
1906 - Ludwig Boltzmann, Austrian physicist
1917 - Marian Smoluchowski, Polish physicist
1943 - AleÅ¡ HrdliÄka, Czech anthropologist
1948 - Richard C. Tolman, American mathematical physicist
2002 - David Todd Wilkinson, American astronomer
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