FlipFact of the Day: On January 7, 1610, Galileo Galilei made the first recorded observation of Jupiter’s four largest satellites: Io, Europa, Ganymede, and Callisto. Of the four Galilean moons, Ganymede is the largest; with a diameter of 5252.4 kilometers, it’s slightly bigger than Mercury. However, due to its composition of water ice and silicate rock, it is only about half as massive as the Solar System’s smallest planet.
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Image: NASA/JPL (true color)
- Chamberlain, V. D. (1981). “Astronomical content of American Plains Indian winter counts”. Bulletin of the Astronomical Society. 13: 793.
Author: Mikael Angelo Francisco
Bitten by the science writing bug, Mikael has years of writing and editorial experience under his belt. As the editor-in-chief of FlipScience, Mikael has sworn to help make science more fun and interesting for geeky readers and casual audiences alike.