Over the past two months NASA has been releasing a number of wonderful long exposure photographs taken by astronaut Don Pettit aboard the International Space Station. While there are many photos like these taken from the perspective of the Earth’s surface, Pettit’s images are unique in that they incorporate the passing blur of entire illuminated cities, aurora, and the sporadic flashes of lightening from thunderstorms. Check out many more photos from the series here. Via Colossal.