A Spaceship from Another Galaxy Passes Over the Solar System

question 23

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 traveling at a speed of 0.80c, for which γ = 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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