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Birth
Fritz Zwicky was born on Feb. 14, 1898. -
Period: to
Grade School
Goes to grade school and boarding school. -
College graduation
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Discovers dark matter
(in some cosmological theories) nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles ( cold dark matter ) or high-energy randomly moving particles created soon after the Big Bang ( hot dark matter ). -
Discovers the Cartwheel Galaxy
The Cartwheel Galaxy is a lenticular ring galaxy about 500 million light-years away in the constellation Sculptor. It has a D₂₅ isophotal diameter of 44.23 kiloparsecs, and a mass of about 2.9–4.8 × 10⁹ solar masses; its outer ring has a circular velocity of 217 km/s. It was discovered by Fritz Zwicky in 1941. -
President's Medal of Freedom
He was rewarded the President's Medal of Freedom. The Presidential Medal of Freedom is the highest civilian award of the United States, along with the Congressional Gold Medal. -
Gold Medal of the Royal Astronomical Society
He was given the Gold Medal of the Royal Astronomical Society. The Gold Medal of the Royal Astronomical Society is the highest award given by the Royal Astronomical Society. The RAS Council have "complete freedom as to the grounds on which it is awarded" and it can be awarded for any reason. -
Death
Dies of heart attack.