WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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Astronomers observe two stars: - Star A is 10 light-years away from Earth and has an apparent brightness of magnitude +3.0. - Star B is 1,000 light-years away from Earth and ALSO has an apparent brightness of magnitude +3.0. What can astronomers conclude regarding the ACTUAL light energy output (luminosity) of Star B compared to Star A?

Star B has the exact same actual energy output as Star A. Star B produces vastly more actual light energy than Star A because it appears equally bright despite being 100 times farther away. Star A produces 100 times more light energy than Star B. Distance has no mathematical effect on apparent brightness.

Correct Answer:

Star B produces vastly more actual light energy than Star A because it appears equally bright despite being 100 times farther away.

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