On April 3rd 2014, the Curiosity Mars lander returned pictures of an unidentified shaft of light in the distance.
The UFO crowd was quick to blame aliens.
“This could indicate there there is intelligent life below the ground and uses light as we do. This is not a glare from the sun, nor is it an artifact of the photo process.” – Scott C. Waring
Other theories include cosmic rays and tricks of light due to the dual cameras on Curiosity.