Photgraphing the moons of Jupiter was reaching the limits of my HUmBLE telescope... Nevertheless, seeing Jupiter and its four Galilean moons (Europa, Io, Callisto, and Ganymede) directly via a telescope is a very exciting experience. These moons have similar diameters (0.90/1.05/1.39/1.51 times) to our moon but are 1650 times further away (630 million km) from Earth compared to our moon (380 thousand km). The fact they can bounce off a few photons from the sun right onto a few pixels of a digital camera sensor is fascinating both on a macroscopic and microscopic scale. The light from those moons takes 35 minutes to reach the Earth.