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.
Linda Hall Library of Science, Engineering, & Technology
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?
