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1915 in science and technology.

1 Astronomy

• Pluto is photographed for the first time but was not recognized as a planet
• Einstein's new theory of general relativity used to explain Mercury's strange motions that baffled Urbain Le Verrier

2 Geology

• Alfred Wegener proposes the theory of Pangea

3 Physics

• Albert Einstein publishes his theory of general relativity.
• Arnold Sommerfeld develops a modified Bohr atomic model with elliptic orbits to explain relativistic fine structure

4 Technology

• George Claude patents the neon discharge tube for use in advertisingAdvertising is the paid promotion of goods, services, companies and ideas, by an identified sponsor. Marketers see advertising as part of an overall promotional strategy. Other components of the promotional mix include publicity, public relations, persona
• NACAThe National Advisory Committee for Aeronautics NACA was a U. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel formed the c, the predecessor of NASAThe National Aeronautics and Space Administration NASA (established 1958) is the government agency responsible for the United States of America's space program and long-term general aerospace research. A civilian organization, it conducts (or oversees) re founded

5 Nobel Prizes

• Sir William Henry BraggSir William Henry Bragg ( July 2, 1862 March 10, 1942) was an English physicist, educated at King William's College, Isle of Man, and Trinity College, Cambridge. He served on the faculties of the University of Adelaide in Australia ( 1886- 1908), the Univ and Sir William Lawrence BraggWilliam Lawrence Bragg ( March 31, 1890 July 1, 1971) was a physicist who won the Nobel Prize in Physics in 1915. Bragg was born in Adelaide, South Australia. He was an impressionable boy and showed an early interest in science. His father, William Henry are awarded the Nobel Prize for Physics
• Richard Martin Willstätter is awarded the Nobel Prize for Chemistry

6 Births

• March 15 - Laurent Schwartz (d. 2002), mathematician.
• June 24 - Fred Hoyle (d. 2001), astronomer and science fiction writer.