Author Question: If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear: ... (Read 20 times)

jeatrice · **on:** Jul 27, 2018

If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:

A) more than 10 times as bright as Earth at its brightest.
B) more than 25 times as bright as Venus at its brightest.
C) more than 10 times as bright as Venus at its brightest.
D) more than 25 times as bright as Earth at its brightest.

Question 2

In the context of blackbody radiation, which of the following statements is true of stars?

A) Temperatures of stars cannot be estimated from their color.
B) Red stars are cool, and blue stars are hot.
C) Red stars are hot, and blue stars are cool.
D) Star temperatures cannot be measured using the relative strengths of various spectral lines.