January 11 in Physics History

Physics history will help you to develop a better understanding of the physics world!

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 11 in Physics History - Births – Physicists born on January 11

Johannes Franz Hartmann (11 Jan 1865 - 13 Sep 1936)

He was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of the interstellar medium. His doctorate was from the University of Leipzig in 1891 on lunar eclipses.

January 11 in Physics History - Deaths – Physicists died on January 11

Isidor Isaac Rabi (29 Jul 1898 - 11 Jan 1988)

He was an Austrian-American physicist who was awarded the Nobel Prize for Physics in 1944 for his invention of the atomic and molecular beam magnetic resonance method of measuring the magnetic properties of atoms, molecules, and atomic nuclei. He spent most of his life at Columbia University, where he performed most of his pioneering research in radar and the magnetic moment associated with electron spin in the 1930s and 1940s. His Nobel-winning work led to the invention of the laser, the atomic clock, and the diagnostic uses of nuclear magnetic resonance. He originated the idea for the CERN nuclear research center in Geneva.

Carl David Anderson (3 Sep 1905 - 11 Jan 1991)​

American physicist who shared the Nobel Prize for Physics in 1936 for his discovery of the positron, the first known particle of antimatter. He examined the photographs of cosmic rays taken as they passed through a Wilson cloud chamber in a strong magnetic field. Besides the curved paths of negative electrons, he found also paths deviating in the opposite direction, corresponding to positively charged particles – yet having the same mass as an electron! Previously, Dirac had predicted such particles by the theoretical solution to electromagnetic field equations. Anderson subsequently found the physical existence of the positron.

Donald E. Osterbrock (13 Jul 1924 - 11 Jan 2007)

He was an American astronomer who was a leading authority on the history of astronomy and director of the University of California’s Lick Observatory. He applied physics to produce accurate models of stars. For example, treating the outer part of the sun as turbulent and convective, he explained the seemingly anomalous fact that the sun’s corona is hotter than its surface. He investigated the nature of ionized gas around hot stars and was a pioneer in the use of spectroscopic methods for the study of gaseous nebulae. He discovered new types of active galactic nuclei, which are powered by black holes in the centers of galaxies. He fostered the construction of the 10-meter Keck Telescopes in Hawaii.

January 11 in Physics History - Events – Physics Events of January 11

The Moons of Uranus

In 1787, William Herschel, a German astronomer, discovered the first two moons of Uranus, six years after he had discovered the planet, on 13 Mar 1781. Titania’s diameter is 998.2 miles (1610 km) and its distance from Uranus is 271,104 miles (436,300 km). Oberon, the outermost of the major moons of Uranus, has a mean diameter of 1523 km and a mean distance from Uranus of 583,500 km. These names were suggested by Herschel’s son John Herschel in 1852 at the request of William Lassell, who had discovered two more moons of Uranus the year before which became known as Ariel and Umbriel.

Don’t Miss Our Newsletter!