🔬 Discovery

Physical binary stars

Estrellas binarias físicas y gravitación fuera del sistema solar

Date
1803 · confidence high
Place
Slough, England
Credited to
William Herschel
People
👤 William Herschel1738–1822
Field
Cosmos & Earth

What was discovered

Herschel demonstrated that some double stars orbit one another, proving that Newtonian gravitation holds beyond the solar system and opening the way to measuring stellar masses.

John Michell had argued statistically in 1767 that the doubles were physical.

What it led to

  • Stellar masses
  • Universality of gravity
  • Astrophysics of binary systems
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