Where, on an H-R diagram do stars most stars spend most of their lifespan?

• The Main Sequence

• The White Dwarf Region

• The Red Dwarf Corner

• The Center

Answer explanation

No matter how long the star will live, 90% of its lifespan is spent on the main sequence.

How is the term “evolution” used differently in astronomy than in biology? Check Two:

• In biology, "Evolution" refers to the life cycle of a single organism.

• In astronomy, "Evolution" refers to the life cycle of a single star.

• In biology, "Evolution" refers to the change of a species over the process of many generations.

• In astronomy, "Evolution" refers to the change of a cluster of stars over time.

Tags

NGSS.HS-ESS1-3

NGSS.HS-LS4-1

NGSS.HS-LS4-2

NGSS.HS-LS4-4

NGSS.HS-LS4-5

How is the term “burn” used differently in astronomy than in everyday usage? (Select two)

• In Astronomy, "Burn" refers to nuclear fusion.

• In Astronomy, "Burn" refers to combustion.

• In everyday usage, "Burn" refers to combustion.

• In everyday usage, "Burn" refers to nuclear fusion.

Tags

NGSS.HS-ESS1-1

What is hydrostatic equilibrium?

• The balanced forces keeping a star's size relatively stable.

• The forces applied to keep the water level stable in a hydroelectric dam.

• A method of slowly burning hydrogen into helium.

Tags

NGSS.HS-ESS1-1

Which two forces are involved in hydrostatic equilibrium?

• An inward pull of gravity

• An outward push of nuclear fusion

• An outward push of electromagnetism

• An inward pull of nuclear fusion

• An inward pull of electron affinity

Tags

NGSS.HS-PS2-4

Why do stars eventually leave the main sequence?

• Boredom

• Run out of hydrogen in the core

• Closing time

• Helium is the new hydrogen

Tags

NGSS.HS-ESS1-1

What is the dividing line between a “low-mass” star and a “high-mass” star? (In solar masses)

• 8

• 2

• 13

• 20

During stage 9 of stellar evolution, what type of star does a Sun-like star become?

• Red Giant

• Blue Dwarf

• Red Dwarf

• White Giant

• Yellow Dwarf

What event ends stage 9 and leads to hydrostatic equilibrium in the stage 9 star?

• Helium fusion

• The fusion of helium into iron

• Hydrogen fusion

• Formation of a planetary nebula

Tags

NGSS.HS-PS1-8

What is the area of an H-R diagram where a star moves up in luminosity a second time due to helium-shell burning called?

• Red giant branch

• Asymptotic branch

• Horizontal branch

• Subgiant branch