1-157-449 - NASA/Oxford Science Archive/Heritage Images

Aurora Australis, April 1994. The curtain form of the Aurora Australis viewed from the Space Shuttle Endeavour, part of which can be seen in top right foreground. Aurorae are caused by the interaction of the particles in the solar wind with the Earth's magnetic field. The phenomenon is most visible in polar regions but in times of intense solar activity can be seen at lower latitudes as well.