Today in Physics History

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birthdays & deaths

Explore all birthdays & deaths of physicists occurred on this day with their short biography!

physics Events

Know all important discoveries made by physicists & events happened on this day with complete information!

January 20 - Births – Physicists born on January 20

Buzz Aldrin (Born on 20 Jan 1930)

He is an American astronaut who was the second man to set foot on the moon. He was one of the third group of astronauts named by NASA. Before that, he was a US Airforce pilot in Korea. He created a record for extravehicular activity outside the spacecraft during his mission in Gemini 12. He piloted the Apollo 11 which was launched on 16 July 1969.

David M. Lee (Born on 20 Jan 1931)

He is an American physicist who shared a Noble Prize for physics in 1996. He was awarded the noble prize because he discovered superfluidity in the isotope of helium-3. He worked with Robert C. Richardson and Douglas D. Osher to build an apparatus that could reduce the temperature to about 0.002K. He-3 could flow without resistance, even to climb the walls of containers and ow down the outside at temperature this low.

Simon Marius (20 Jan 1573 - 26 Dec 1624)

He was a German astronomer who was one of the earliest users of the telescope. He was also the first to mention the existence of the Andromeda Nebula in 1612. The four largest moons of Jupiter are named by him. He made the discovery independently of Galileo but Galileo was credited by other astronomers. He prepared the tables of the mean periodic motion of the four moons and also spotted the sunspots in 1611.

January 20 - Deaths – Physicists died on January 20

Mary Watson Whitney (11 Sep 1847 - 20 Jan 1921)

She was an American astronomer who succeeded Maria Mitchell as professor and director of the Vassar College Observatory. The astronomy department was developed by her and introduced eight different astronomy courses. The observatory staff published at least 102 papers in major astronomical journals during her tenure. This was all based on comets, asteroids, and variable stars.

January 20 - Events – Physics Events of January 20

Galileo Left His Room

In 1633, Galileo went against everything and everyone to renounce his belief that the Earth revolved around the sun. He left his home in Florence, Italy to face the law in Rome when he was 68 years old.

The Discovery of Optical Pulsar

The New York Times made headlines for the discovery of the first optical pulsar by the astronomers of the University of Arizona. It was in 1969 and the result of one year of search using the stroboscopic technique. They noticed the flashes of light from the same location in the Crab Nebula. Later it was found that the previous and the latest signal has the same pulsation. This was confirmed to be coming from the single star.

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