A

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Q. Consider the following astral bodies:
1. Sirius
2. Venus
3. Mars
The correct sequence in decreasing order of their brightness is:

  • (A) 2, 3, 1
  • (B) 1, 2, 3
  • (C) 3, 2, 1
  • (D) 2, 1, 3
  • Correct Answer - Option(D)
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Explanation by: Admin
The brightness of astral bodies is measured in apparent magnitude (lower values mean brighter objects). The correct decreasing order of brightness is:

1. Venus: Brightest object in the night sky after the Moon (Apparent magnitude: -4.9 to -3.5)


2. Sirius: Brightest star in the night sky (Apparent magnitude: -1.46)


3. Mars: Brightness varies depending on its position, but it is usually dimmer than Venus and Sirius (Apparent magnitude: -2.9 to +1.8)

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