Consider Three Galaxies,Alpha,Beta and Gamma

question 49

Multiple Choice

Consider three galaxies,Alpha,Beta and Gamma.An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c.At what speed would an observer in Alpha see the galaxy Beta moving?

• A)0.82c
• B)0.70c
• C)0.94c
• D)0.35c
• E)0.57c

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