Usa tourism for FIG Different comet tail lengths compared. The outermost planet is Jupiter. Image credit Sirscha Nicholl. Here, as elsewhere, images of the planets are courtesy of NASA. Comet dust tails may also be very wide. The tail of Donati’s Comet fig was as wide as the Big Dipper’s handle degrees, while that of Tebbutt’s Comet see fig. . Usa tourism 2016.