Evolution of stars

What is the large cloud of gas, ice, and dust called that forms starts?

• protostar

• prestar

• comet

• nebula

What are about 90% of all stars classified as?

• main sequence

• supergiants

• giants

• white dwarfs

What forms as the core of a giant star no longer supports fusion and the star's outer layers escape into space, leaving a hot dense core?

• giant star

• white dwarf

• supernova

• black hole

Which is an area of space that is so dense that nothing can escape its pull of gravity?

• white dwarf

• supernova

• black hole

• neutron star

Which is the outer layer of the Sun that emits light into space?

• photosphere

• chromosphere

• convection zone

• radiation zone

Which of the following statements best explains why a star is on the main sequence

• The star's mass is approximately equal to the mass of the Sun

• The gravitational force balances the force from nuclear fusion

• The star has just becomre a supernova.

• The star's temperature lies in on the main sequence range

Which type of star is formed from a supernova?

• giant

• supergiant

• neutron star

• white dwarf

The Hertzsprung-Russell diagram plots

• The temperatures of stars on the horizontal axis and the masses

• The magnitudes of stars on the horizontal axis and the temperatures on the vertical axis

• The magnitudes of stars on the vertical axis and the temperatures on the horizontal axis

• the masses of the stars on the vertical axis and the temperatures on the horizontal axis

How is energy from the core of the Sun transmitted to the photosphere?

• nuclear fusion

• radiation and convection

• radiation

• convection

The Sun is classified as which type of star?

• supergiant

• main sequence

• white dwarf

• giant