Io, Europa, Ganymede and Callisto


This photo from the other night is of Δια (Jupiter) rising in the eastern sky. Jupiter or Dia has 67 moons of which we can make out two in the photo. It is probably Ganymede that we see farthest from the planet and maybe Callisto just below the planet. These are two of the four named the Galilean Moons for they were first seen from Earth by Galileo Galilei while fiddling with his new invention – the telescope – in 1610.

The point of view of the photo is the planet rising above Palouki, Skopelos. Earth and Jupiter are close now, on the same side of the Solar System.

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