HR Diagrams

Warm-up: life cycle of stars

Multiple Choice

All stars begin their life as a

• Main Sequence

• Nebula

• Protostar

• Black Dwarf

Multiple Choice

A gigantic explosion that causes the death of a large star is called

• pulsar
• red giant 
• supernova
• black hole

Multiple Choice

The core of a Red Giant collapses and becomes a ___________________.

• White Dwarf
• Blue Supergiant
• Red Supergiant
• Black Hole

Multiple Choice

The stage after the main sequence star:

• red giant

• nebula

• white dwarf

• black dwarf

Multiple Choice

When a star's gravitational pull is so strong that not even light can escape, it's called a what?

• Black hole
• Supernova
• White dwarf
• Nebula

Multiple Choice

A stellar nebula is made up of...

• clouds of gas

• clouds of gas and dust

• stars

• planets

Multiple Choice

What stage fills in the blank. Nebula --> Main sequence --> red giant --> ______________ --> white dwarf --> black dwaft

• supergiant
• planetary nebula
• black hole
• supernova

Multiple Choice

Which of the following is NOT a final stage of a star. 

• black hole
• black dwarf
• neutron star
• red giant

Multiple Choice

Our sun is

• A High Mass Star

• Average Star

• Supernova

• Giant

Multiple Choice

Larger stars (stars with more mass) have a ___________ life cycle than smaller stars.

• Longer Life span

• Shorter Life span

Multiple Choice

What is the densest type of star?

• main sequence star

• neutron star

• white dwarf

• black dwarf star

Multiple Choice

The amount of energy (light) a star emits is called its ___.

• magnitude
• luminosity
• radiance

Multiple Choice

What is the difference between apparent magnitude and absolute magnitude of a star.

• Apparent magnitude is the true brightness; absolute magnitude is how bright it is observed from Earth

• Apparent magnitude measures distance; absolute magnitude measures color.
• Apparent magnitude is the observed brightness from Earth; absolute magnitude is the true brightness

• Apparent magnitude is the total light emitted; absolute magnitude is the light received.

Multiple Choice

According to the H-R diagram, where is the Sun located?

• Blue giants

• Red giants

• Main sequence

• White dwarfs

Multiple Choice

Which spectral class represents the coolest stars?

• O

• A

• G

• M

Multiple Choice

Which type of star is most common in the universe according to the H-R diagram?

• Main Sequence

• Red Giants

• White Dwarfs

• Blue Giants

Multiple Choice

The Sun is classified as a ___ star in terms of spectral class.

• G
• F

• K

• A

Multiple Select

Which of the following are characteristics of Red Giants?

• High luminosity

• Low temperature

• Blue-white color

• Spectral Class O

HR Diagram Practice

Multiple Choice

What factor affects the color of a star?

• The size of the star.
• The temperature of the star.
• The distance from Earth.
• The composition of the star.

Multiple Choice

What factor affects the luminosity of a star?

• Temperature and size of the star
• Age and composition
• Color and brightness
• Distance from Earth

Multiple Choice

What is the approximate surface temperature of the sun?

• Near 10,000 K

• Approximately 5,800 K

• Roughly 7,500 K

• About 3,000 K

Fill in the Blanks

White dwarf stars have a

surface temperature than red super giants.

Fill in the Blanks

Stars with the highest surface temperature are

.

Fill in the Blanks

Stars with the lowest surface temperature are

.

Reorder

Order the color of the stars from hottest to coldest

• blue

• white

• yellow

• orange

• red

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

Most of the stars on the HR Diagram are classified as which type of star?

• Neutron stars
• White dwarf stars
• Red giant stars
• Main sequence stars

Multiple Choice

What type of star has a high temperature but a low luminosity?

• Neutron star
• White dwarf
• Red giant
• Main sequence star

Multiple Choice

What type of star has a high temperature and a high luminosity?

• O-type stars
• M-type stars
• A-type stars
• B-type stars

Multiple Choice

What does the H-R diagram measure about stars?

• The distance of stars from Earth

• The brightness (luminosity) and temperature (color) of stars

• The age of stars

• The chemical composition of stars

Multiple Choice

What type of star has a low temperature but a high luminosity?

• Blue dwarf
• White giant
• Yellow main-sequence
• Red supergiant

Multiple Choice

What type of star has a low temperature and a low luminosity?

• White dwarf
• Yellow supergiant
• Blue giant
• Red Main sequence stars