The disk of the milky way is about 105 light years in, Ask an Expert

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The disk of the Milky Way is about 10⁵ light years in diameter. A cosmic-ray proton enters the galactic plane with speed v = 0.99c.

a) How long does it take the proton to cross the galaxy from out viewpoint?

b) How long does the proton think it takes?

c) How wide is the galaxy to the proton (in its direction of motion)?

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