Cause of Lunar Twilight Rays Seen by Apollo Astronauts to Be Investigated by LADEE MissionCause of Lunar Twilight Rays Seen by Apollo Astronauts to Be Investigated by LADEE Mission
<p>Back in the 60s and 70s, Apollo astronauts circling the Moon saw something that still puzzles researchers today. About 10 seconds before lunar sunrise or lunar sunset, pale luminous streamers