Stellar Brightness Formative Assessment

The brightness of stars in the night sky varies.  One measure of the brightness of a star is apparent magnitude, which is the brightness of the star as seen from Earth.  The distance of stars from Earth also varies and is measured in light years.  Figure 1 shows the apparent magnitude of several stars.

Figure 1

Table 1 shows the distance of several stars from Earth.

Table 1

DOK Level 1

According to Table 1, what star is 25 light years from Earth?

DOK Level 2

According to Table 1, what is the distance from Earth for the dimmest star shown in Figure 1?

DOK Level 3

Johnny claims that the further a star is from Earth, the brighter the star appears in the sky.  Do you agree or disagree with Johnny’s claim? Support your argument with data from Figure 1 and Table 1.