On this day in 2006 - January 19th - NASA's New Horizons spacecraft was launched.
The spacecraft made a flyby of the Plutonian system in the summer of 2015, and on New Year's Day 2019, followed it up with a flyby of the Kuiper Belt object informally called Ultima Thule, but later renamed Arrokoth.
On this day in 1930 - January 20th - Edwin "Buzz" Aldrin was born.
The second man to step onto the Moon has been not only an astronaut, but also an Air Force combat pilot, aerial gunnery instructor and flight commander. His doctoral thesis at MIT was on techniques for manned orbital rendezvous.
On this day in 1908 - January 21st - Danish astronomer and astrophysicist Bengt Strömgren was born.
He applied quantum mechanics to understanding stars, produced pioneering work in the chemical composition of stars, and discovered vast shells of ionized hydrogen around stars, now known as Strömgren Spheres.
On this day in 1592 - January 22nd - Pierre Gassendi was born.
Gassendi was a French philosopher, priest, astronomer, and scientific observer, experimentalist and chronicler. He was the first person ever to see a planet transiting the Sun when he observed the 1631 transit of Mercury.
On this day in 2004 - January 25th - the Mars rover Opportunity landed on the red planet.
The mission was designed to last 90 Martian days, but it was operational until the summer of 2018 when an exceptionally severe dust storm blanketed Mars for three months. The rover didn't recover from the loss of power, and the mission was officially brought to an end in February 2019.
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