What colour are the coolest stars?

The coolest stars are red.

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What is meant by the 'luminosity' of a star?

Luminosity is the amount of energy emitted by a star per second.

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What does a lower apparent magnitude indicate?

A lower apparent magnitude indicates a brighter star.

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Why is it difficult to compare stars based on their apparent magnitude alone?

Because the apparent magnitude of a star depends on its distance from Earth.

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What is absolute magnitude?

Absolute magnitude compares the brightness of stars at a standardised distance of 10 parsecs.

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What does the Hertzsprung-Russell diagram show?

The Hertzsprung-Russell diagram shows the variation in star brightness and temperature/colour.

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What does the x-axis of the Hertzsprung-Russell diagram represent?

The x-axis represents the temperature of the stars.

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What does the y-axis of the Hertzsprung-Russell diagram represent?

The y-axis represents the absolute magnitude of a star.

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What type of stars are found in region A?

Red supergiants

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What type of stars are found in region B?

Red giants

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What type of stars are found in region C?

White dwarfs

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What type of stars are found in region D?

Main Sequence

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