Aurora Astern . ... Credit Copyright: STS-68 Crew , NASA Explanation: Sailing upside down, 115 nautical miles above Earth, the crew of the Space Shuttle Endeavour made this spectacular time exposure of the southern aurora (aurora australis) in October of 1994. ... They are typically visible from the Earth's surface at high latitudes and are triggered by high energy particles from the Sun . ... Star trails are the short streaks above Earth's horizon. ... NASA Official: Jay Norris. ...