Today is the first day of fall, the season of football, sweaters, and everything pumpkin. Soon the days will grow shorter. With less sunlight, trees will stop making chlorophyll for their leaves (goodbye, green), allowing carotenoids to peek through (hello, yellow and orange). It’s all going to look very pretty, and astronaut Scott Kelly, who won’t experience autumn this year, seems to have found his own version of it in Earth’s terrain.
