The Milky Way galaxy is a part of a group of galaxies called the Local Group. The proper distanc...

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The Milky Way galaxy is a part of a group of galaxies called the Local Group. The proper distance from the Milky Way, on one side of the Local Group, to the M31 galaxy on the other side is approximately \( 2.4 \times 10^{6} \) light-years. How long (in \( \times 10^{5} \) years) would it take a spaceship traveling at \( 0.999 c \) to travel this distance according to travelers onboard?
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