#Sunburned? Extragalactic Radiation Is a Tiny Bit to Blame

Every second, every square meter of Earth is bombarded by 10 billion photons born beyond the Milky Way, according to a new study. That may sound like a lot, but it’s just 10 trillionths of the total number that bathe every square meter of the planet.

from Space.com ift.tt/2b9w6qS

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