Select the statement that accurately compares the luminosity (absolute brightness) of a main sequence white, class A star to a main sequence red, class M star.
– The white class A star would have a greater luminosity (absolute brightness) than the red class M star.
– The luminosity (absolute brightness) of the stars would be equal because they are the same distance from Earth.
– The Sun would be brighter than both the white class A star and the red class M star.
– The red class M star would have a greater luminosity (absolute brightness) than the white class A star.
Select the statement that accurately compares the luminosity (absolute brightness) of a main sequence white, class A star to a main sequence red, class M star.
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The correct statement is: The white class A star would have a greater luminosity (absolute brightness) than the red class M star.
Explanation: Main sequence stars like those in the A class (white) are much hotter and more massive than M class (red) stars. As a result, they produce and emit more light, leading to a greater luminosity. Generally, the order of luminosity from high to low among main sequence stars is O, B, A, F, G (like the Sun), K, and then M.