author={Seth Barnes Nicholson},
  journal={Publications of the Astronomical Society of the Pacific},
  pages={85 - 85}
  • S. B. Nicholson
  • Published 1 April 1939
  • Physics
  • Publications of the Astronomical Society of the Pacific
The four large moons of Jupiter were, as you all know, discovered by Galileo in 1610 with a telescope which he himself had made. This telescope with an aperture of about 2 inches magnified some 30 times, and was probably the largest and most powerful telescope in existence at that time. The story of how this famous discovery was made is best told in Galileo’s own words which are quoted from his account in The Sidereal Messenger as translated by E. S. Carlos. 
37 Citations

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