In physics, The Keating Model is a model that theoretical physicist Patrick N. Keating introduced in 1966 to describe forces induced on neighboring atoms when one atom moves in a solid.
Patrick Pierre Roger Baudry (born March 6, 1946 in Cameroon), is a retired Lieutenant Colonel in the French Air Force and a former CNES astronaut.
 In 1985, he became the second French citizen in space, after Jean-Loup Chrétien, when he flew aboard NASA's Space Shuttle mission STS-51-G.
Prof. Dr. Ernst Willi Messerschmid (born May 21, 1945) is a German physicist and former astronaut.
Chladni is a small lunar impact crater that lies near the northwest edge of Sinus Medii, in the central part of the Moon.
 The crater is named for German physicist and musician Ernst Chladni who, in 1794, wrote the first book on meteorites.
 The rim of the crater is roughly circular, and there is a small central floor at the midpoint of the sloping inner walls.
 This feature has a higher albedo than the surrounding terrain.
 It is connected by a low ridge to the rim of the crater Murchison, which lies to the northwest.
 About 55 km due east of Chladni is the larger Triesnecker.
Abbe is a lunar impact crater that is located in the southern hemisphere on the far side of the Moon.
 It is located just to the south of the crater Hess, and lies to the east of the large walled basin Poincaré.
 It is named after the German physicist Ernst Abbe.
Eilhard Ernst Gustav Wiedemann (1 August 1852, Berlin – 7 January 1928, Erlangen) was a German physicist and historian of science.
 He was the son of physicist Gustav Heinrich Wiedemann (1826–1899), and an older brother to Egyptologist Alfred Wiedemann (1856–1936).
Ernst Pringsheim Sr. (11 July 1859 – 28 June 1917) was a German physicist.
 He was born and died in Breslau.
Wolfgang Karl Ernst Finkelnburg (5 June 1905 – 7 November 1967) was a German physicist who made contributions to spectroscopy, atomic physics, the structure of matter, and high-temperature arc discharges.
 His vice-presidency of the Deutsche Physikalische Gesellschaft 1941-1945, was influential in that organization’s ability to assert its independence from National Socialist policies.
Ernst Karl Abbe HonFRMS (23 January 1840 – 14 January 1905) was a German physicist, optical scientist, entrepreneur, and social reformer.
 Together with Otto Schott and Carl Zeiss, he laid the foundation of modern optics.
 Abbe developed numerous optical instruments.
 He was a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and other optical systems.
Otto Richard Lummer (July 17, 1860 – July 5, 1925) was a German physicist and researcher.
 He was born in the city of Gera, Germany.
 With Leon Arons, Lummer helped to design and build the Arons–Lummer mercury-vapor lamp.
 Lummer primarily worked in the field of optics and thermal radiation.
 Lummer's findings, along with others, on black body radiators led Max Planck to reconcile his earlier Planck's law of black-body radiation by introducing the quantum hypothesis in 1900.
 In 1903, with Ernst Gehrcke, he developed the Lummer–Gehrcke interferometer.
 Lummer died in Breslau.

Question: Who was a German physicist Patrick Baudry or Ernst Messerschmid?
Answer: Ernst Willi Messerschmid