On this day in 1882 - October 5th - Robert Goddard was born.
He was an American engineer, professor, physicist, and inventor who is credited with creating and building the world's first liquid-fuelled rocket. Although he received little public support in his lifetime, he's now considered one of the founding fathers of modern rocketry.
On this day in 1873 - October 8th - Danish chemist and astronomer Ejnar Hertzsprung was born in Copenhagen.
Hertzsprung and American astronomer Henry Norris Russell, independently, developed a scatter plot of stars that related their absolute magnitudes to their effective temperatures. It's known as the Hertzsprungâ€“Russell diagram (abbreviated H-R diagram).
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