NASA Has One More Chance to Explain Bizarre Glow on Moon's Horizon

Later this month, a NASA spacecraft will get one last chance to solve the mystery of the strange "horizon glow" seen on the moon. Scientists think the glow is caused by tiny particles of moon dust catching the sun's ultraviolet rays, becoming electrically charged, and then shooting upwards. But they don't know for… » 4/07/14 4:56pm 4/07/14 4:56pm