Prof. Dr. Ernst Willi Messerschmid (born May 21, 1945) is a German physicist and former astronaut.
German submarine "U-719" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II.
 The submarine was laid down on 3 July 1942 at the H. C. Stülcken Sohn yard at Hamburg, launched on 28 April 1943, and commissioned on 27 July 1943 under the command of "Oberleutnant zur See" Klaus-Dietrich Steffens.
 Attached to "5th U-boat Flotilla" based at Kiel, "U-719" completed her training period on 30 April 1944 and was assigned to front-line service.
The international Ernst von Siemens Music Prize (German: "Ernst von Siemens Musikpreis" ) is an annual music prize given by the Bayerische Akademie der Schönen Künste (Bavarian Academy of Fine Arts) on behalf of the Ernst von Siemens Musikstiftung (Ernst von Siemens Music Foundation), established in 1972.
 The foundation was established by Ernst von Siemens (1903–1990) and promotes contemporary music.
 The prize honors a composer, performer, or musicologist who has made a distinguished contribution to the world of music.
 In addition to the main prize, other prizes are also given.
 The total prize money given is currently 3.5 million euros, with the winner of the main prize receiving €250,000.
 The prize is sometimes known as "the Nobel Prize of music".
The Ernst Schering Prize is awarded annually by the Ernst Schering Foundation for especially outstanding basic research in the fields of medicine, biology or chemistry anywhere in the world.
 Established in 1991 by the Ernst Schering Research Foundation, and named after the German apothecary and industrialist, Ernst Christian Friedrich Schering, who founded the Schering Corporation, the prize is now worth €50,000.
Uwe Flade is a German music video director and entrepreneur.
 He has directed videos for many artists, such as a-ha, Depeche Mode, Franz Ferdinand, In Extremo, Nickelback and Rammstein.
 He also created worldwide successful apps for kids like nighty night and little box music box with Egmont Mayer, Heidi Wittlinger and Grit Schuster.
Ernst Thälmann is an East German film in two parts about the life of Ernst Thälmann, leader of the Communist Party of Germany during much of the Weimar Republic, directed by Kurt Maetzig and starring Günther Simon in the title role.
 The first picture, "Ernst Thälmann - Sohn seiner Klasse" (Son of his Class), was released in 1954.
 It was followed by the 1955 sequel "Ernst Thälmann - Führer seiner Klasse" (Leader of his Class).
Klaus-Dietrich Flade (born August 23, 1952) is a German pilot and former German Aerospace Center astronaut who visited the Mir space station in 1992 aboard the Soyuz TM-14 mission, returning to Earth a week later aboard Soyuz TM-13.
Hermann Flade (22 May 1932 – 15 May 1980) was a German political scientist.
Prince Ernst August of Hanover, (legal name German: "Ernst August Prinz von Hannover Herzog zu Braunschweig und Lüneburg, Königlicher Prinz von Großbritannien und Irland" .
 Named "Ernst August Andreas Philipp Constantin Maximilian Rolf Stephan Ludwig Rudolph", he was born 19 July 1983, the eldest child of Ernst August, Prince of Hanover (head of the ancient House of Welf which once ruled the Kingdom of Hanover), and his former wife Chantal Hochuli.
Friedrich Diercks (Also: "Friedrich Ernst") was born on June 18, 1796, at Burg (castle) Gödens near the village of Neustadtgödens.
 In February 1814 he joined the Oldenburg Regiment of the Duke of Oldenburg, and he remained a soldier until June 1819.
 In 1831, Friedrich Diercks  received land at Mill Creek in Austin County and began writing letters to friends in Oldenburg and Westphalia.
 Upon reading about the favorable conditions in Austin's colony, he and his family set out for Texas.
 On April 16 Ernst obtained a league of land on the west bank of the west fork of Mill Creek in Austin's colony.
 Ernst became well known as a benefactor to new German immigrants and acquired the nickname "father of the immigrants."
 Later on in life, he became a justice of the peace in Austin County and sold lots from his league to new immigrants.
 The resulting settlement, Industry, was the first German town in Texas.
  Ernst died in 1848.

Question: What do German's Klaus-Dietrich Flade and Ernst Messerschmid have in common?
Answer: astronaut