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Use Cases
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Resources
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Pricing
1901
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classified thousands of stars to the OBAFGKM sequence based on spectra
1911 - 1913
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devised the Hertzsprung-Russell (H-R) diagram which plotted the luminosities of stars against their colors
1924
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discovered the empirical mass-luminosity relationship of a star
1927 - 1932
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calculated approximate distance to center of galaxy, determined period for sun to complete one revolution of Milky Way, calculated the mass of the Milky Way, and discovered evidence of dark matter
1929
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Hubble's Law - proportionality between distance and speed of galaxies
1929
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proposed the theory that solar energy is released through a process called nuclear fusion
1930
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discovered Pluto
1937
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became first legitimate radio astronomer after inventing the first radio telescope
1946 - 1947
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discovered Herbig-Haro objects - gas clouds associated with young stars
1950
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coined the term "Big Ban Theory" for a concept which he did not accept, believed in the steady-state model of the universe instead
1951
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discovered the Kuiper belt of minor planets andcomets at the edge of the solar system (among other things)
1958
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discovered radiation belts around the Earth that he named Van Allen Belts
1960
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discovered the first quasar
1967
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discovered the first four pulsars, though Bell was not recognized as a recipient of the Nobel Prize in Physics
1967
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Coined the term "black hole" and introduced the concept of space foam
1971 - 1973
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discovered the first black hole - known as Cygnus X-1
1973
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proved that black holes emit radiation and eventually evaporate by combining the theory of general relativity and quantum theory
1975
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proposed the most widely accepted theory of the moon's creation - debris from the Earth after a collision congealed to form the moon
1977
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discovered the rings of Uranus
1978
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developed the cosmic evolution theory known as the inflationary universe
1978
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discovered Charon - Pluto's largest satellite
October 1994
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led the team who discovered the first Brown Dwarf
2005
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work resulted in the demotion of Pluto to a dwarf planet