Praxis 5005 Practice Test Practice Question
The following table shows the approximate distance from Earth for each of four stars. Based on the information presented, the amount oftime needed to reach Farth is greatest for light emitted from which of the following stars?
Correct Answer: D
Rationale: The amount of time needed for light to travel from a star to Earth is directly related to the distance of the star from our planet. Among the options provided, Gacrux is the farthest star, meaning its light takes the longest to reach us.
Arcturus, Pollux, and Aldebaran, while significant stars, are closer to Earth compared to Gacrux. Therefore, the light emitted from these stars travels shorter distances, resulting in less time to arrive. In summary, Gacrux, being the most distant, requires the greatest time for its light to reach Earth, while the other stars, being nearer, require less time.
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