The best time of year to see them is during winter, when darkness in the upper latitudes stretches up to 24 hours.
Cloaked by the darkness of winter, the hurricane's eye became visible as Saturn's northern hemisphere transitioned into spring.
And finally, those who suffer from seasonal affective disorder (SAD) or other mental health conditions can find the darkness of winter especially difficult, making them less productive and interested in work.
During the winter months in the darkness, after your head-torch's batteries have succumbed and failed in the cold, you are left to feel your way around your environment blindly, whilst being a prisoner of your own mind.
Across Sweden, Midsummer is greeted with an exuberance that's hard to understand unless you've experienced the cold and darkness of a Swedish winter.
The film started out as a project for 21 BAS personnel and contractors to help occupy their free time during the winter when the continent is locked in darkness and freezing conditions.
BBC: Scriptwriter's mum too scared to watch Antarctic horror
In winter, when the continent is locked in darkness and freezing conditions, staff learn skills such as woodwork and black and white photography to help while away their free time.
Sir Ranulph Fiennes is leading a team of five other explorers in a quest to achieve a feat no other human has managed - to walk across Antarctica in the near permanent darkness and super low temperatures of winter.
Altered day-night cycle: the Antarctic winter involves a period of over three months of complete darkness where the sun does not rise above the horizon.
Currently it is northern winter on Vesta, and the northern polar region is in perpetual darkness.
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