1915 In Science

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

Geology

• Alfred Wegener proposes the theory of Pangea

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

Technology

• George Claude patents the neon discharge tube for use in advertising
• NACA, the predecessor of NASA founded

Nobel Prizes

• Sir William Henry Bragg and Sir William Lawrence Bragg are awarded the Nobel Prize for Physics
• Richard Martin Willsttter is awarded the Nobel Prize for Chemistry

Births

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

Deaths

• July 22 - Sir Sandford Fleming (b. 1827), Canadian engineer and surveyor known as the "father of time zones".

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