Conversation

TIL about Rjukan, a Norwegian town in a valley that receives no sunlight in winter, but built mirrors to bring some in.

Some peaks on the moon get sunlight for 90% of the year [https://skyandtelescope.org/sky-and-telescope-magazine/peaks-of-eternal-light/], but year-round light on Earth would need a 540km-high mountain at the south pole.

https://www.theguardian.com/world/2013/nov/06/rjukan-sun-norway-town-mirrors