Question

Which two characteristics are used to classify stars on the Hertzsprung-Russell diagram?

A. size and density
B. density and composition
C. composition and temperature
D. temperature and absolute brightness
Does anyone know this answer?

Answer 1

density, temperature, and also absolute brightness

Step-by-step explanation:

I looked it up. sorry hope it helps...

Answer 2

D. temperature and absolute brightness

Step-by-step explanation:

Hertzsprung-Russell diagram classify stars by:

temperature and absolute brightness