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

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Students in a 5th grade class in Frederick, Maryland, observe the night sky during a field trip. They notice that the Sun appears far brighter and larger than Sirius, even though Sirius is actually a much larger and hotter star than the Sun. Which explanation best accounts for why the Sun appears so much brighter than Sirius when viewed from Earth?

The Sun is located much closer to Earth than Sirius is. Sirius is located behind Earth's atmosphere during the day. The Sun produces nuclear light while Sirius only reflects light. Sirius is blocked by dust clouds in the solar system.

Correct Answer:

The Sun is located much closer to Earth than Sirius is.

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