Our galaxy is 10^5 light years across and the most energetic cosmic ray proton are...

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Nicole C

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...observed with a speed such? Our galaxy is 10^5 light years across and the most energetic cosmic ray proton are observed with a speed such that they have a relativistic mass of about 10^10 times the rest mass of a resting proton.
Determine how long it would take these energetic protons to transverse our galaxy as measured in reference of the galaxy AND the proton.
 
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