Knowledge of a star's temperature and ________ enables us to ...

[mydiamond]

Knowledge of a star's temperature and ________ enables us to calculate its radius, surface area, and volume from the appropriate radiation law.
 
  Fill in the blank(s) with correct word

Question 2

Why is Galileo Regio, the large circular feature on Ganymede, so dark?
 
  A) It is composed of dense basaltic mantle rock that once flowed like lunar mare.
  B) It is the result of micrometeorite dust settling onto it over several billion years.
  C) It has an asphalt-like material that is like the dark side of Iapetus of Saturn.
  D) It is the result of ultraviolet light from the Sun interacting with the ice and creating a substance that is quite dark.
  E) It is the site of a recent meteorite impact that scattered a lot of dark, rocky material.

[annierak]

Answer to Question 1

luminosity or absolute magnitude

Answer to Question 2

B

[mydiamond]

TY

[annierak]

You're welcome