The star Alpha Centauri A is the same type of star as the Sun, but its luminosity is about 1.6 times that of the Sun. What can we conclude?
A) Alpha Centauri A must have a vastly different interior structure than the Sun.
B) Alpha Centauri A fuses hydrogen into helium in its core at a higher rate than our Sun.
C) Alpha Centauri A has a much higher surface temperature than the Sun.
D) Alpha Centauri A is much farther from Earth than the Sun.
Question 2
Suppose you look at a spectrum of visible light by looking through a prism or diffraction grating. How can you decide whether it is an emission line spectrum or an absorption line spectrum?
A) The only way to decide is to make a graph of the intensity of the light at every wavelength, and then analyze the graph carefully.
B) An emission line spectrum consists of a long bright line, while an absorption line spectrum consists of a long dark line.
C) An emission line spectrum consists of bright lines on a dark background, while an absorption line spectrum consists of dark lines on a rainbow background.
D) The emission line spectrum is produced by electrons jumping up in energy level, while the absorption line spectrum is produced by electrons jumping down in energy level.
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The Sun is the star at the center of the Solar System.
Looking toward the Sun from Alpha Centauri in Celestia
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A sea star