Determine how many kilometers across is the galaxy

Reference no: EM13672521

The cosmic rays of highest energy are protons that have kinetic energy on the order of 1013 MeV.

(a) Find how long would it take a proton of this energy to travel across the Milky Way galaxy, as measured in the proton's frame? (The Milky Way has a diameter of ~ 105 light-years as measured in its rest frame.)

(b) From the point of view of the proton, determine how many kilometers across is the galaxy?

Reference no: EM13672521

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