The constant, omnidirectional hail of cosmic rays that stream through the Solar System from the galaxy beyond may not be as uniform as we thought.According to China's Chang'e 4 lander on the far side of the Moon, there's a strange 'cavity' in the cosmic ray flux between the Earth and Moon that appears when the two bodies line up in just the right way. It's a discovery that suggests galactic cosmic rays are not as evenly distributed as we had assumed, possibly opening opportunities for space exploration that could help mitigate the radiation hazard these charged particles pose. Space can…