nine satellites in all but only four are visible in any but the most powerful telescope and three cannot be seen except in photographs. The four large satellites may be seen to change their positions from hour to hour, occasionally disappearing in the shadow behind Jupiter, and then reappearing with startling abruptness on the other side._-_figure_149.jpg)
THE PLANET JUPITER.
Photographed by Yerkes Observatory through the 40-inch refractor. With a stronger glass they may be seen moving as bright spots across the face of the planet, followed or preceded by the dark disks of their shadows.
With a large telescope, various colored belts are seen to streak this globe like dark stripes from east to west, the most prominent ones being the two deep red bands some 7000 miles broad which lie on either side of a faint golden equatorial belt, some 6000 miles across. Besides these, there are lesser belts to the north and
[253]
