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"Which stars have low temperatures and high luminosities? A. Red giants B. White dwarfs C. Main sequence stars"

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Answer

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Step 1
: Understand the problem

We are given descriptions of stars and asked to determine which type of stars have low temperatures and high luminosities.

Step 2
: Recall the properties of each star type

Red giants are stars with large radii, low temperatures (around 3,000 - 4,000 K), and high luminosities. White dwarfs are compact stars with small radii, high temperatures (up to 100,000 K), and low luminosities. Main sequence stars have a wide range of temperatures and luminosities, depending on their mass.

Final Answer

The correct answer is red giants (A).

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