EVERYDAY SCIENCE

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: -Apparent magnitude (m) is a measure of the brightness of a star or other astronomical object observed from Earth. An object’s apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object’s light caused by interstellar dust along the line of sight to the observer.

Detailed explanation-3: -What is Absolute Magnitude? Absolute magnitude is a measure of the star’s luminosity which refers to how bright the star would be if viewed from the distance of 10 parsecs, or 32.58 light years. It refers to the fact that to determine the true brightness of a light source, we need to know how far away it is.

Detailed explanation-4: -measuring stellar properties By convention, the absolute magnitude (M) is defined as the magnitude that a star would appear to have if it were located at a standard distance of 10 parsecs. These quantities are related through the expression m − M = 5 log10 r − 5, in which r…

Detailed explanation-5: -Measurement. The Sun is the brightest star as viewed from Earth, at −26.74 mag. The second brightest is Sirius at −1.46 mag.