Grade 5 MISA Practice Questions - Maryland Integrated Science Assessment - Grade 5 Exam

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A student looks at the constellation Orion during a clear winter night in Frostburg, Maryland. Betelgeuse and Rigel appear almost equally bright in the sky, but astronomical data shows that Rigel is about 860 light-years away from Earth while Betelgeuse is about 550 light-years away. What can the student conclude about Rigel's actual brightness (luminosity) compared to Betelgeuse?

Rigel must give off more total light than Betelgeuse because it is farther away yet appears equally bright. Betelgeuse produces more light than Rigel because it is closer to Earth. Both stars produce the exact same total amount of light energy. Betelgeuse appears dimmer because light travels faster from Rigel.

Correct Answer:

Rigel must give off more total light than Betelgeuse because it is farther away yet appears equally bright.

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