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Answer:

1. What factor or characteristic affects the surface temperature of a star?

• The surface temperature is determined by the luminosity and radius.

2. What star color has the highest and lowest temperatures?

• Red stars are the coolest and white stars are the hotter.

3. What is the approximate surface temperature of the Sun? How can you compare it with the temperature of red star?

• The sun has a surface temperature of 5,500 K, typical for a yellow star. Red stars are cooler than the sun, with surface temperatures of 3,500 K for a bright red star and 2,500 K for a dark red star.

4. Which is brighter, Sirius B or Rigel? What caused the difference?

• Sirius is similar in appearance, but significantly brighter than Rigel.

5. What is the luminosity value of the sun? What factor affects the luminosity of a star?

• The Luminosity of the sun is 3.846 × 10 rase to the power of 26 watts. The factor affects of the luminosity of a star as the size of a star increases, and temperature also affects a star's luminosity.

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