An increase in solar activity is causing more spectacular displays of the northern—and southern—lights, as recently captured by the crew of the International Space Station. NASA has released rare footage of the Aurora Australis, or southern lights, taken by ISS astronauts as the station passed over the Indian Ocean, the Guardian reports. Images of the phenomenon, caused when particles from solar flares flow toward Earth, were made into a time-lapse video. (More southern lights stories.)