Author Question: The Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is ... (Read 38 times)

dalyningkenk · **on:** Jul 27, 2018

The Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is about 1,300 watts per square meter.

Determine the apparent brightness we would measure for the Sun if we were located half the earth's distance from the Sun.

Question 2

Most radio galaxies belong to Hubble's class ________.

Fill in the blank(s) with correct word

braelync · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

The Sun would appear four times brighter. So the apparent brightness would be 4 1,300 watts per square meter = 5,200 watts per square meter.

Answer to Question 2

E or elliptical