Unit 3: Stars and the Origins of the Universe (AME)

____ is the quantity that is crucial for deciding what route a star's life will take.

• Temperature

• Mass

• Age

• Formation Speed

During the protostar phase, increasing amounts of gas and dust to its core. The core becomes hotter and more dense. When the core reaches 10 million degrees Celsius _____ begins. This transitions the protostar to a main sequences star.

• cosmic background radiation

• nuclear fusion

• redshift

• supernova explosion

Tags

NGSS.HS-ESS1-1

What happens when a protostar begins nuclear fusion of hydrogen in its core?

• mayhem & destruction ensues

• the protostar becomes (officially) a real star

• no one really knows since it hasn't been observed (yet)

• the protostar may explode due to the outward pressure

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

Main sequence stars are stable because

• the energy from nuclear fusion in the core balances the force of gravity pulling inward.

• the gravitational pull of surrounding planets keeps the star from collapsing.

• magnetic fields inside the star prevent expansion and contraction.

• the outer layers of gas are constantly escaping into space, relieving internal pressure.

Tags

NGSS.HS-ESS1-1

______ must begin in the core of stars for them to be considered main sequence stars.

• carbon and/or iron fission depending on the star's mass.

• fusion of deuterium isotopes.

• helium fusion.

• hydrogen fusion

Tags

NGSS.HS-ESS1-1

How a star's life will end directly depends on

• the type of nebula that formed it.

• its mass.

• the galaxy it formed in.

• the original contents of its core.

Tags

NGSS.HS-ESS1-1

A high mass, main sequence star, is running out of hydrogen in its core. What will it transition to next?

• Red Giant

• Red Super Giant

• Supernova

• Neutron Star

Tags

NGSS.HS-ESS1-3

What can form from a Supernova?

• Neutron Star or White Dwarf

• Black Hole or Planetary Nebula

• Neutron Star or Black Hole

• Red Supergiant or Red Giant

Tags

NGSS.HS-ESS1-3

At the end of their life, low to medium mass stars form

• Black Holes.

• Neutron Stars.

• White Dwarfs.

• Red Dwarfs.

A Red Giant is the result of which kind of star?

• high mass star

• low to medium mass star

• the decay of a red supergiant

• black dwarf