Auroras can also be spotted on other planets. This sharp blue aurora glows half a billion miles away on Jupiter. This photo is a result of a NASA Hubble Space Telescope close-up. One of the many details that make this aurora different from those seen on Earth are the “satellite footprints” within them. As NASA writes, “Auroral footprints can be seen in this image from Io (along the lefthand limb), Ganymede (near the center), and Europa (just below and to the right of Ganymede's auroral footprint).” These emissions, produced by electric currents generated by the satellites, bounce in and out of the upper atmosphere.