On this day in 1857 â€“ December 16th â€“ British author Arthur C. Clarke was born.
Clarke wrote more than 100 books and he inspired the scientists and space explorers. In honor of his work, the International Astronomical Union named the distance of 36000 km above Earth the Clarke Orbit, and asteroid No. 4923 received the designation 'Clarke'.
On this day in 1904 â€“ December 20th â€“ The Mount Wilson Solar Observatory was founded.
About fifteen years later, "solar" was dropped from the name as the 100-inch Hooker telescope came into use. Observing with it, Edwin Hubble found evidence that the Milky Way was just one galaxy in an expanding Universe.