Glenn Chaple's Observing Basics: The Medicean stars
November 2009: Jupiter's four largest moons were evidence that not all celestial bodies orbit Earth.
September 28, 2009
You're a newcomer to backyard astronomy. You've already used your telescope to explore the Moon, marveling at its majestic cratered terrain. The experience whetted your appetite to probe deeper into space. What next?
In drawings from Sidereus Nuncius, Galileo depicted Jupiter’s moons as asterisks. The Italian scientist discovered Io, Europa, and Callisto January 7, 1610, and Ganymede 6 days later.
Photo by Linda Hall Library of Science, Engineering, & Technology
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