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Mean free path

Mean free path of gamma rays (very high energy and ultra high energy) based on photon energy (expressed in electron-volts on horizontal axis). Mean free path is expressed on a 10log scale of mega-parsecs (i.e. "–1" indicates 0.1 Mpc, "3" equals 1,000 Mpc, etc.). The primary form of attenuation is pair production by collision with extragalactic background light (EBL) and cosmic microwave background (CMB).

In physics, mean free path is the average distance over which a moving particle (such as an atom, a molecule, or a photon) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.

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