1. What is the angular diameter of a star like the sun located 5 ly from Earth? Is the Hubble… 1 answer below »

1. What is the angular diameter of a star like the sun located 5 ly from Earth? Is the Hubble Space Telescope able to detect detail on the surface of such a star? (Hint: Use the small-angle formula, Chapter 3.) 2. If a sunspot has a temperature of 4200 K and the average solar photosphere has a temperature of 5800 K, how many times brighter is a square meter of the photosphere compared to a square meter of the sunspot? (Hint: Use the Stefan-Boltzmann law, Chapter 6.)  

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