Question

a hertzsprung - russel diagram is shown. which stars tend to have the greatest range of temperatures and the highest luminosities? red giants white dwarfs supergiants main sequence

Explanation:

The Hertzsprung - Russell diagram shows that supergiants have a wide range of temperatures and the highest luminosities compared to red giants, white dwarfs, and main - sequence stars. Supergiants can be very hot (blue supergiants) or relatively cool (red supergiants), and their luminosities are extremely high.

Answer:

supergiants