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Question 1
How do the authors use both qualitative and quantitative information to explain the way that light is used to determine the age of far-off light sources?
The authors use qualitative information to compare looking at far-away light sources to "looking back in time." Next, they support this statement with quantitative information by writing that the sun’s light takes eight minutes to reach us here on earth. Go to question 2.
Question 2
How do the authors use both qualitative and quantitative information to explain the age of galaxy EGS-zs8-1?
First, the authors give the qualitative information that the galaxy is "extremely old" and then provide the quantitative information that it is 13.1 billion years old to support the claim that the galaxy is extremely old. Go to question 3.
Question 3
How do the authors use qualitative, quantitative and visual information to convey the brightness and activity of galaxy EGS-zs8-1?
First, the authors give the qualitative information that light from the galaxy is faint, because it is so far away. This is also provided visually in the photograph, where the tip of the arrow shows very little light where the galaxy is located. However, they also describe the galaxy as "surprisingly active and bright." This qualitative statement is supported by the quantitative statements that the galaxy "had built up about 8 billion suns’ worth of mass," which is more than 15 percent of the mass of the Milky Way. They also explain that this is significant, because the galaxy is creating stars at "roughly 80 times the rate the Milky Way does" and at the point that astronomers observed it, the galaxy had created these stars in "a few hundred million years" compared to the 13 billion that the Milky Way has been creating stars.
