HR Diagram 2026

For Main Sequence Stars, what is the relationship between Temperature and Luminosity?

• Direct. As surface temperature increases, luminosity increases.

• Inverse. As surface temperature decreases, luminosity increases.

• Constant. As surface temperature decreases, luminosity remains the same.

• Cyclic. As surface temperature decreases, luminosity varies in a repeating pattern.

For Main Sequence Stars, what is the relationship between Mass and Luminosity?

• Direct. As mass increases, luminosity increases.

• Inverse. As mass increases, luminosity decreases.

• Constant. As mass increases, luminosity remains the same.

• Cyclic. As mass decreases, luminosity varies in a repeating pattern.

Which statement is true?

• The hottest stars are red and the coolest stars are blue.

• The hottest stars are blue and the coolest stars are red.

• The hottest stars are yellow and the coolest stars are white.

• The hottest stars are white and the coolest stars are yellow.

Procyon B and Sirius B are classified as

• White Dwarfs

• Main Sequence

• Giants

• Supergiants

Pollux and Aldebaran are classified as

• White Dwarfs

• Main Sequence

• Giants

• Supergiants

Rigel and Betelgeuse are classified as

• White Dwarfs

• Main Sequence

• Giants

• Supergiants

Bellatrix and Wolf 359 are classified as

• White Dwarfs

• Main Sequence

• Giants

• Supergiants

If a star was 4,000 K and 0.1 solar units, it would be classified as a

• White Dwarf Star

• Giant Star

• Main Sequence Star

• Supergiant Star

Which two stars have a solar radius of 10?

• Sirius B and Procyon B

• Sun and Alpha Centauri B?

• Spica and Pollux

• Ross 128 and Proxima Centauri

Which of these stars is the hottest?

• Beta Centauri

• DX Cancri

• Betelgeuse

• The Sun