Everything you need to understand or teach Nightfall by Isaac Asimov.
In 1941, John W. Campbell, Jr., editor of the premier science fiction magazine at that time, asked one of the fledgling writers he mentored an intriguing question: What would happen if people saw the stars only once every thousand years? He postulated that people would go mad and asked twenty one-year old Isaac Asimov to write a story about it. The result was "Nightfall," now one of the most famous science fiction stories of...