Question

hr diagram checkpoint
hertzsprung - russell diagram
luminosity (l_sun)
temperature (×10²k)
which section of the diagram includes the coolest, brightest stars?
section 1
section 3
section 2
section4

Explanation:

On an H - R diagram, lower temperature is on the right side (lower x - values represent lower temperatures in terms of Kelvin), and higher luminosity is on the upper side (higher y - values represent higher luminosities). Section 2 has stars with relatively low temperatures (right - hand side) and high luminosities (upper side).

Answer:

Section 2