GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Color and distance from Earth to the star.
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Color and temperature of the star.
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Color and composition of the star.
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Apparent magnitude and distance from Earth to the star.
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Detailed explanation-1: -Gloria is at the observatory and is examining a newly discovered star through a powerful telescope. She wants to find out how bright the star actually is. What information does she need to calculate the absolute magnitude of a star? Apparent magnitude and distance from Earth of the star.
Detailed explanation-2: -However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers define star brightness in terms of apparent magnitude-how bright the star appears from Earth-and absolute magnitude-how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.
Detailed explanation-3: -Dimmer stars are zero or positive numbers. The larger the number means the dimmer the star is. For example, a star-1 magnitude is brighter than a star 0 magnitude. A star 0 magnitude is brighter than a star 1 magnitude.