The Earth is about 150 million km from the Sun, and the apparent ...

[dalyningkenk]

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]

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

[dalyningkenk]

YES! Correct, THANKS for helping me on my review

[yeungji]

Thanks for the timely response, appreciate it