Stars' Evolution

High-mass stars burn hotter & brighter because they have more _______ at their cores.

• fusion

• fuel

• energy

• pressure

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Why do high-mass stars skip the helium flash stage that low-mass stars go through before dying?

• Not enough hydrogen at the core.

• Once hydrogen is used up at the core the star explodes.

• Once helium is used up at the core the star explodes.

• High-mass stars never die.

When temperatures are high enough in the core of a high-mass star, this element starts to form.

• helium

• carbon

• oxygen

• hydrogen

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

When fusion in low-mass stars form this element in its core, the helium flash stage begins.

• helium

• carbon

• oxygen

• hydrogen

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

When an ______ core is reached in a high-mass star, gravity takes over.

• iron

• carbon

• oxygen

• helium

Tags

NGSS.HS-ESS1-3

When an iron core is reached gravity takes over and a(n) _________ occurs.

• black hole

• neutron star

• explosion

• supernova

Tags

NGSS.HS-ESS1-3

Supernovas are one of the largest _______ in the Universe.

• events

• stars

• explosions

• objects

Tags

NGSS.HS-ESS1-3

Almost all stars form from nebulae at about the same time in _____.

• clouds

• galaxies

• groups

• clusters

_____ stars evolve and move off the main-sequence first; then intermediate stars & so on.

• Low-mass

• Red giant

• High-mass

• White dwarf

Tags

NGSS.HS-ESS1-3

The dividing line between high & low-mass stellar evolution is called the

• dividing line.

• main sequence turn off.

• zero-age main sequence.

• HR Diagram.

Tags

NGSS.HS-ESS1-3