Joseph Rotblat

Jovan Stosic July 26, 2020

Sir Joseph Rotblat KCMG CBE FRS (4 November 1908 – 31 August 2005) was a Polish physicist, a self-described “Pole with a British passport”.[2] Rotblat worked on Tube Alloys and the Manhattan Project during World War II, but left the Los Alamos Laboratory after the war with Germany ended. His work on nuclear fallout was a major contribution toward the ratification of the 1963 Partial Nuclear Test Ban Treaty. A signatory of the 1955 Russell–Einstein Manifesto, he was secretary-general of the Pugwash Conferences on Science and World Affairs from their founding until 1973 and shared, with the Pugwash Conferences, the 1995 Nobel Peace Prize “for efforts to diminish the part played by nuclear arms in international affairs and, in the longer run, to eliminate such arms.”

https://en.wikipedia.org/wiki/Joseph_Rotblat

Roche limit

Jovan Stosic July 23, 2020

In celestial mechanics, the Roche limit, also called Roche radius, is the distance within which a celestial body, held together only by its own force of gravity, will disintegrate due to a second celestial body’s tidal forces exceeding the first body’s gravitational self-attraction. Inside the Roche limit, orbiting material disperses and forms rings, whereas outside the limit material tends to coalesce. The term is named after Édouard Roche (pronounced [ʁɔʃ] (French), /rɔːʃ/ rawsh (English)), who was the French astronomer who first calculated this theoretical limit in 1848.

https://en.wikipedia.org/wiki/Roche_limit