We are protect from Gamma Rays, but if it very close the Gamma Rays like 4,000 light years we are toast, but why are was sometimes protected by Gamma Rays?
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Answer: The ozone layer protect us. The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects. When the sky is clear, there is an inverse relationship between stratospheric ozone and solar UVR measured at the Earth's surface.-Sep 11, 2012, This also happen to Gamma Rays.