Higher mass protostars enter the main sequence: A) faster and ...

[geoffrey]

Higher mass protostars enter the main sequence:
 
  A) faster and at a higher luminosity and temperature.
  B) faster and at a lower luminosity and temperature.
  C) slower and at a higher luminosity and temperature.
  D) slower and at a lower luminosity and temperature.
  E) at the same rate, but at a higher luminosity and temperature.

Question 2

Describe the conditions of matter and radiation when in a state of thermal equilibrium.
 
  What will be an ideal response?

[stillxalice]

Answer to Question 1

A

Answer to Question 2

In thermal equilibrium, matter and energy freely change into one another through pair production and pair annihilation.