33. 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?
Answer: D
The amount of time needed to reach Earth from Farth is greatest for light emitted from Gacrux.
Light emitted from Gacrux takes the longest time to reach Earth compared to the other stars listed, indicating that it is the farthest away.
A) Arcturus
Arcturus is one of the closer stars in the table, which means that the light emitted from it takes less time to reach Earth compared to Gacrux. Therefore, it cannot be the correct answer as it does not represent the longest distance.
B) Pollux
Pollux is also relatively closer to Earth than Gacrux, resulting in a shorter travel time for its emitted light. This means Pollux is not the correct choice for the star with the greatest distance.
C) Aldebaran
While Aldebaran is farther than both Arcturus and Pollux, it is not as distant as Gacrux. Thus, light from Aldebaran does not take the longest time to reach Earth, disqualifying it as the correct answer.
D) Gacrux
Gacrux is the most distant star listed in the question. Consequently, the light emitted from Gacrux takes the longest time to travel to Earth, making it the correct answer.
Conclusion
Gacrux is definitively the star from which light takes the longest to reach Earth, as it is the farthest among the options provided. The other stars—Arcturus, Pollux, and Aldebaran—are closer, resulting in shorter travel times for their emitted light.