If the universe is assumed to contain an infinite number of uniformly distributed luminous stars, then every point in the sky should be as bright as a star. So why is the sky dark at night? That is the question posed by Olbers's paradox, named for astronomer Heinrich Wilhelm Olbers, who described it in 1823, more than 200 years after Johannes Kepler first posed the question as an argument against the notion of a limitless universe with infinite stars. How has the paradox since been resolved?
Robert Louis Stevenson
Back in the day
The Munich massacre occurred at the 1972 Summer Olympics in Munich, Germany, when members of the Israeli Olympic team were taken hostage by members of Black September, a Palestinian terrorist organization. Two of the athletes were killed during their capture and nine others lost their lives in the course of a failed rescue attempt, during which a German police officer and five of the eight kidnappers were killed as well. What went wrong during the rescue attempt at FÃ¼rstenfeldbruck airbase?
Born on a day like today
Lafayette was a French aristocrat most famous for his participation in the American and French revolutions. Considered a national hero in both France and the US, he is one of only six people in history to have become an Honorary Citizen of the US. Lafayette is also credited with having created the modern French flag in July 1789. He lived in retirement in France during the First Empire, but returned to the US in 1824 to attend the inaugural banquet of what university?