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This is the goal: To make available for life every place where life is possible. To make inhabitable all worlds as yet uninhabitable, and all life purposeful.

Hermann Oberth

Overdue Obituary

Donald Lynden-Bell CBE FRS (5 April 1935 – 6 February 2018) British theoretical astrophysicist.


  • He was the first to determine that galaxies contain supermassive black holes at their centres, and that such black holes power quasars.[3] Lynden-Bell was President of the Royal Astronomical Society (1985–87)

  • Received numerous awards for his work, including the inaugural Kavli Prize for Astrophysics.

  • "Violent Relaxation." Violent relaxation has many applications in dynamical astronomy, affecting the orbits of stars within star clusters and galaxies.

  • "Gravothermal Catastrophe" a phenomenon in star clusters that is the result of the negative heat capacity of gravitational systems. The catastrophe occurs when the core of a cluster shrinks and heats up, causing it to transfer energy to stars in the cluster's halo, leading the cluster core to collapse.

  • Authored an influential 1974 paper with James E. Pringle about the evolution of disks around "nebular variables," which were later to become known as T Tauri stars – an early phase in a star's life cycle. The paper predicts the signature of radiation from such disks, which is emitted primarily at infrared wavelengths where it dominates over the emission from the star.

  • In the 1980s, he was a member of a group of astronomers known as the 'Seven Samurai' who postulated the existence of the Great Attractor, a huge, diffuse region of material around 250 million light-years away that results in the observed motion of our local galaxies.

  • Donald was married to Ruth Lynden-Bell, a British chemist, emeritus professor of Queen's University Belfast and the University of Cambridge,

Lynden-Bell died at his home in Cambridge on 6 February 2018, at the age of 82

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Chat with David Baker

Are the Russians using satellites to inspect those from other countries?

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SLS

Program planning for 2 Mobile Launchers 1st major cargo-only flight *might* be Europa Clipper, now set for a Block 1, not a Block 1B Block 1B delayed to mid-2020s Block 1 now likely to fly 4 times, including on EM-2 crew Orion flight. Spying and the military in space in general.

Jamies Space Fact

Space Song playlist on spotify


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