Question

1. how do apparent magnitude and absolute brightness

compare and contrast?

key terms

• apparent magnitude: how

bright a star appears from earth

• absolute brightness: how bright

a star really is

apply concepts individually – progress check
directions: answer the question in complete sentences.

1. think: there are two stars visible in the night sky. one star has a higher absolute brightness than

the other. how could the star with the higher absolute brightness have a lower apparent
magnitude?

Explanation:

For the question "How do apparent magnitude and absolute brightness compare and contrast?"

• Similarity: Both are measures related to the brightness of stars.
• Difference: Apparent magnitude describes how bright a star appears from Earth (depends on distance and actual brightness), while absolute brightness describes how bright a star really is (intrinsic brightness, independent of distance from Earth).

Apparent magnitude depends on both a star’s absolute brightness (intrinsic brightness) and its distance from Earth. A star with higher absolute brightness (intrinsically brighter) can have a lower apparent magnitude (appear dimmer from Earth) if it is much farther away from Earth than the other star. The greater distance can make its apparent brightness (as seen from Earth) lower, even though it is intrinsically brighter.

Answer:

• Comparison: Both are related to the brightness of stars.
• Contrast: Apparent magnitude is the brightness of a star as seen from Earth (influenced by distance and true brightness), while absolute brightness is the star’s true, intrinsic brightness (not affected by its distance from Earth).

For the question "There are two stars visible in the night sky. One star has a higher absolute brightness than the other. How could the star with the higher absolute brightness have a lower apparent magnitude?"