Stellar Evolution

Which of the following characteristics determines the color of a star?

• Luminosity

• Temperature

• Distance

• Mass

Answer explanation

Temperature determines color.

What is revealed by the BLUE color of the supergiant star, Rigel?

• It is fairly cool

• It is close

• It is very hot

• It is no longer emitting light

Answer explanation

Blue stars are the hottest.

Which of the following stars are near the end of their life cycle?

• Main sequence

• White dwarfs

• Giants

• Supergiants

Answer explanation

White dwarfs are stars that have exhausted all of their nuclear fuel.

Stars like our sun most likely formed directly from a ___________, which is a cloud of dust and gas.

• Protostar

• Nebula

• Main sequence star

• Red giant

Which of the following characteristics determines the life cycle of a star?

• Luminosity

• Temperature

• Color

• Mass

Our sun's NEXT phase in its life-cycle

• Nebula

• Red supergiant

• Red giant

• Planetary nebula

The COOLEST stars appear to be what color?

• Yellow

• Red

• Blue

• White

The brightness of a star depends on its:

• Color and temperature

• Distance and temperature

• Distance and color

• Size and temperature

Using the figure, name the star that is very dim and red in color.

• Barnard's star

• Betelgeuse

• Mira

• Alpha Centauri A

According to the HR diagram, what is the approximate surface temperature of Alcor?

• 3,000 K

• 5,000 K

• 10,000 K

• 20,000 K