Final answer:
Stars appear small due to vast distances, with most of the brightest stars being hotter than the Sun. Temperature and luminosity generally correlate, with exceptions.
Explanation:
Stars look much smaller than the Sun due to their great distances from Earth. Even though they are enormous in size, the vast distances make them appear tiny. This is similar to how a grapefruit in New York City would look like another grapefruit in San Francisco when compared to the distances between stars.
Most of the brightest stars in the sky listed in Appendix J are hotter than the Sun. The reason for this difference lies in the luminosities of the stars. Temperature and luminosity tend to have a correlation, where hotter stars often have higher luminosities, but there can be exceptions based on individual star characteristics.
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