Jupiter is the fourth brightest object in the sky and has been known about since prehistoric times as a wandering star. Galileo’s observations of Jupiters’ moons contributed to the acceptance of Copernices’ heliocentric model of the Solar System. Three of the moons are clearly seen in this image.
The Satelittes
There is only two satelittes showing in the picture not three. The shadow is likely from the satelitte to the right of Jupiter.
Great picture though!