Two stars are at rest relative to each other. In their common rest frame, these stars are 90.0 light-years apart. If they are measured to be 68.7 light-years apart by the navigator of a spaceship
Traveling between them, how fast is the spaceship moving relative to these stars?
A) 0.558c
B) 0.604c
C) 0.505c
D) 0.646c

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The Answer of Two stars are at rest relative to each other. In their common rest frame, these stars are 90.0 light-years apart. If they are measured to be 68.7 light-years apart by the navigator of a spaceship
Traveling between them, how fast is the spaceship moving relative to these stars?
A) 0.558c
B) 0.604c
C) 0.505c
D) 0.646c

Two Stars Are at Rest Relative to Each Other