Every astronaut since 1969 landings has seen strange “flashing lights” while approaching the Moon :
More worryingly, the astronauts continued to see the flashes when they returned home from space under various light conditions.
So what is it?
Scientists believed that the strange flashes were being caused by cosmic rays hitting the astronauts.
Cosmic rays are defined as “a highly energetic atomic nucleus or other particle travelling through space at a speed approaching that of light.”