On this day in 1963 - February 5th - Dutch astronomer Maarten Schmidt had a sudden insight that provided the clue to solving the mystery of quasars.
Schmidt realized that a quasar wasn't an object in our Galaxy, and its unusual spectrum wasn't full of unknown elements. It was mostly composed of hydrogen that was redshifted because of its enormous distance away in an expanding Universe.
On this day in 1971 - February 6th - Alan Shepard hit the first golf balls on the Moon.
The Apollo 14 lunar module landed on the Moon on February 5th with lunar module pilot and Ed Mitchell and commander Alan Shepard. Shepherd made the lunar golf shots on their second exploration of the Moon.