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Physics, 30.03.2020 23:31 liapooh73p7b896
A cosmic ray (an electron or nucleus moving ar speeds close to the speed of light) travels across the Milky Way at a speed of 0.98 times the spee of light. If the Milky way is 30,000 pc across, how long does this journey take in our (essentially stationary) frame of reference and the cosmic ray's frame of reference, in years?
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A cosmic ray (an electron or nucleus moving ar speeds close to the speed of light) travels across th...
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