Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) mass on the horizontal axis and luminosity on the vertical axis
B) surface temperature on the horizontal axis and luminosity on the vertical axis
C) mass on the horizontal axis and stellar age on the vertical axis
D) interior temperature on the horizontal axis and mass on the vertical axis
E) surface temperature on the horizontal axis and radius on the vertical axis
Question 2
Which of the following statements about scientific models is true?
A) A model can be used to explain and predict real phenomena.
B) All current models are correct.
C) A model tries to represent all aspects of nature.
D) A model tries to represent only one aspect of nature.
E) All models that explain nature well are correct.