ES 30.2 Life of a star

Gravitational energy from rapid spinning in a protostar is converted to

• helium.

• heat energy.

• hydrogen.

How many times can a star go supernova?

• One

• Two

• Three

Our Sun will end its life as a

• nova.

• supernova.

• white dwarf.

Tags

NGSS.HS-ESS1-1

A nebula typically contains

• 50% hydrogen, 50% helium.

• 75% hydrogen, 25% oxygen.

• 70% hydrogen, 28% helium, 2% other elements.

In the H-R Diagram, our Sun lies

• in the upper left of the main sequence.

• in the middle of the main sequence.

• above the main sequence.

Tags

NGSS.HS-ESS1-1

In the H-R Diagram, stars spend most of their existence

• in the main sequence.

• above the main sequence.

• below the main sequence.

To help understand the life cycle of a star, scientists must

• observe the star's entire life.

• only observe stars as they burnt out.

• observe different stars at different parts of their life cycle.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

When a sun-sized star runs out of hydrogen in its inner core and enters its third stage, it starts to burn hydrogen in its outer core and becomes a

• supergiant.

• red giant.

• supernova.

Tags

NGSS.HS-ESS1-1

A sun-sized star will begin its second stage of life

• in the main sequence.

• as a black hole.

• as a white dwarf.

A sun-sized star's first stage of life is

• on the main sequence.

• a protostar.

• black dwarf.

Tags

NGSS.HS-ESS1-1