Total Darkness
It has been fifteen years since the sun has last risen. People got used to living a life in darkness. In this short amount of time the human race has developed scotopic vision, the ability to see in the dark. Even though the world once held cities filled with dazzling lights, now no one even dares to hit a light switch. With their scotopic vision comes a price. The brightness of unnatural light makes them blind. The only time artificial lights are used is when they are growing crops for the community. Even then the people working with the crops require such heavy protective gear to protect their sight. The sun no longer exists. It was destroyed by two planets colliding. Even with the sun destroyed the Earth still rotates around the spot where the sun used to rest. People hold onto hope that one day a new sun will form lifting the darkness that has settled upon them.