Assertion: cosmic ray | /r/CapableOf | reach the ground
Facets:
Source sentences:
text: Another technique, useful for measuring cosmic rays that reach the ground, uses a phenomenon called the Cerenkov effect.
text: Higher off the ground cosmic ray radiation becomes more of a problem, indeed astronauts have a problem as the cosmic rays which hit them up in space are generally of a much higher energy than the cosmic rays which reach the ground.
text: When the cosmic rays collide with molecules in the upper atmosphere, they create cascades of over 10 billion secondary particles, known as air showers, which can cover an area exceeding 40 square kilometers by the time they reach the ground.