A Spaceship from Another Galaxy Passes Over the Solar System $\gamma$

question 16

Multiple Choice

A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 *1011 m.) On Earth, the spaceship is observed to be travelling at a speed of 0.80 c, for which $\gamma$ = 5/3. As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively:

• A)9.0* 1010 m; 375 s.
• B)9.0 *1010 m; 625 s.
• C)1.5 * 1011 m; 625 s.
• D)2.5 * 1011 m; 625 s.
• E)2.5 * 1011 m; 1042 s.

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