GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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one is closer to Earth so it appears brighter
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they are the same distance from Earth so they have the same absolute magnitude
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the one that appears brighter is not covered by clouds
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one is farther away from Earth so it appears brighter
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Detailed explanation-1: -The smaller the distance between the observer and object, the greater the apparent brightness. (left) Two stars, A and B, with the same apparent magnitude. (right) However, star A is actually a more luminous star that is further away from the Earth than than star B.
Detailed explanation-2: -A star’s brightness also depends on its proximity to us. The more distant an object is, the dimmer it appears. Therefore, if two stars have the same level of brightness, but one is farther away, the closer star will appear brighter than the more distant star-even though they are equally bright!
Detailed explanation-3: -Figre 6: Two stars can appear to be the same brightness, even though they are different distances from Earth. Obviously, as can be seen from the diagram above, two stars can have the same apparent magnitude, despite having a very different intrinsic brightness, due to their differing distances from Earth.
Detailed explanation-4: -If a star is precisely 10 pc away from us, its apparent magnitude will be the same as its absolute magnitude. If the star is closer to us than 10 pc, it will appear brighter than if it were at 10 pc, so its apparent magnitude will be smaller than its absolute magnitude.