The Many Moons of Jupiter Galileo published his discovery of the first 4 moons in 1610. That number stayed stubbornly at 4 until 1892 when a 5th was discovered by Edward Emerson Barnard, known better for Barnard’s Star. Since the 1900’s many more have been discovered as telescopes improved. The minor moons, as the 88 non-Galilean ones are known, are generally much smaller, having radii of only a few kilometers. This visualization shows 5 years (in the future) of the minor moons in orbit around J

Curious as to what telescopes Galileo may have used to discover the moons of Jupiter, phases of Venus, and craters on the Moon? 🔭 For astronomer Galileo Galilei’s birthday, Chris pulled out two very special items in our collections. The first is a replica Galilean telescope made in Florence, Italy, for the grand opening of the first planetarium in the Western Hemisphere (that’s us! 🙋) in 1930. The second is the oldest telescope known to exist outside Europe! It is one of the few telescopes kno

The 300 Unique Moons That Circle The Planets In Our Solar System | How The Universe Works