When could the Moon possibly be brighter than the Sun? The Sun is much bigger, produces energy, and gives all the energy needed for life on Earth.  But if you look at the sky in gamma rays, the highest energy photons on the electromagnetic spectrum, you’ll see the Moon more easily than the Sun.  Why? The Moon is the brightest gamma ray source in the sky, because it has no atmosphere or magnetic field.  Essentially it has no protection from the dangerous cosmic rays that are constantly zipping through space.  When they hit the Earth’s atmosphere they create a cosmic...