Exit Ticket # 1: Evolution of Stars

Which of these largely determines a star's life cycle?

• Its distance from the sun

• Its mass at birth

• Its luminosity

• Its location in a galaxy

A star is born when a nebula

• collapses

• evolves

• fuses

• reproduces

A protostar becomes a main sequence star after _______ begins

• neutron transfer

• a supernova

• sequencing

• nuclear fusion

How long is a star a main sequence star?

• 50 to 100 years

• Hundreds to thousands of years

• Millions to billions of years

• Trillions to quadrillions of years

What portion of stars in the universe are main sequence stars?

• 50%

• 75%

• 90%

• 100%

A star becomes a red giant when helium in its core fuses into _____.

• carbon

• nitrogen

• iron

• oxygen

Low-mass stars like the sun become a _____ when their core collapses.

• constellation

• black hole

• neutron star

• white dwarf

As a star much more massive than the sun dies, its core fuses elements up to _____ before its core collapses.

• carbon

• nitrogen

• iron

• oxygen

When the core of a star much more massive than the sun collapses, what is the explosion it produces called?

• supernova

• black hole

• planetary nebula

• galactic collapse

The most massive stars are believed to form a _____ when they die.

• neutron star

• red supergiant

• planetary nebula

• black hole