This Day In History
This Day In History
Thursday, May 28, 2020


October 15, 2001

NASA's Galileo spacecraft passes within 112 miles of Jupiter's moon Io. The radiation environment near Io in particular was very unhealthy for Galileo's systems, and so these flybys were saved for the extended mission when loss of the spacecraft would be more acceptable.
Io, NASA, Galileo spacecraft, spacecraft, space

January 7, 1610

Galileo Galilei makes his...
Galileo Galilei makes his first observation of the four Galilean moons : Ganymede, Callisto, Io and Europa, although he is not able istinguish the last two until the following day. The Galilean moons are the four moons of Jupiter discovered by Galileo Galilei in January 1610. They are the largest of the many moons of Jupiter and derive their names from the lovers of Zeus: Io, Europa, Ganymede and Callisto. Ganymede, Europa and Io participate in a 1:2:4 orbital resonance. They are among the most massive objects in the Solar System outside the Sun and the eight planets, with radii larger than any of the dwarf planets.
Galileo, Jupiter, Ganymede, Callisto, Io, Europa
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