GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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apparent magnitude
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absolute magnitude
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size
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position in the sky
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Detailed explanation-1: -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-2: -The apparent magnitude of a celestial object, such as a star or galaxy, is the brightness measured by an observer at a specific distance from the object. The smaller the distance between the observer and object, the greater the apparent brightness.
Detailed explanation-3: -On the modern magnitude scale, Sirius, the star with the brightest apparent magnitude, has been assigned a magnitude of −1.5. Other objects in the sky can appear even brighter. Venus at its brightest is of magnitude −4.4, while the Sun has a magnitude of −26.8.
Detailed explanation-4: -The Sun is the brightest star as viewed from Earth, at −26.74 mag. The second brightest is Sirius at −1.46 mag.