"At the moment when the Voyager spacecraft got closest to Uranus, the Sun was shining directly on the planet's south pole. Uranus takes about 17 hours to rotate once on its axis. If Voyager took a photo of the south pole 8.5 hours later, what would it observe?"

a) the south pole was in darkness

b) the south pole was brightly lit, with the Sun shining down on it

c) the south pole was in twilight

d) the south pole was facing directly away from the Sun

e) more than one of the above