H-R Diagram Quiz

What are the two main properties used to classify stars on the H-R diagram?

• Mass and volume

• Temperature and luminosity

• Color and size

• Density and age

Which of the following is NOT a main region of the H-R diagram?

• Main sequence

• Red giants

• Blue dwarfs

• White dwarfs

Where are the hottest and brightest stars located on the H-R diagram?

• Upper right

• Lower right

• Upper left

• Lower left

What is the primary source of energy for stars like the Sun?

• Nuclear fission

• Chemical reactions

• Nuclear fusion

• Gravitational collapse

Who are the scientists credited with developing the H-R diagram?

• Isaac Newton and Albert Einstein

• Stephen Hawking and Carl Sagan

• Ejnar Hertzsprung and Henry Norris Russell

• Galileo Galilei and Johannes Kepler

What does the spectral type of a star indicate?

• Its luminosity

• Its temperature

• Its size

• Its age

Which spectral class is the hottest?

• M

• F

• O

• K

Where is the Sun located on the H-R diagram?

• Upper right

• Lower left

• Main sequence

• Upper left

What type of star is cooler than the Sun but much brighter?

• White dwarf

• Main sequence star

• Red giant or supergiant

• Blue giant

What does luminosity class indicate?

• A star's temperature

• A star's size

• A star's age

• A star's mass