... Credit Copyright: Peter Knappert Explanation: In late September, two planets were opposite the Sun in Earth's sky, Jupiter and Uranus. ... The faint greenish disk of distant planet Uranus is near the upper left corner. ... Farthest from Jupiter is Callisto , with Europa and Io all left of the planet's disk, while Ganymede stands alone at the right. ... Publications with keywords: Jupiter - Callisto - Europa - Ganymede - Io - Uranus - Oberon - titania . ... Gibbous Europa . ... Opposite the Sun . ...