Astrophysics: The Lifecycle of Stars

Why can't we study the lifespan of stars in the same way we study living organisms on Earth?

• Stars are too bright to study.

• Stars do not change over time.

• Stars are too far away to observe.

• Stars have much longer lifespans than humans.

What does the HR diagram help us understand about stars?

• The lifecycle and properties of stars.

• The distance of stars from Earth.

• The gravitational pull of stars.

• The chemical composition of stars.

What happens to a star when it reaches stellar equilibrium?

• It becomes a black hole.

• It explodes as a supernova.

• Its pressure and gravity forces balance each other.

• It stops burning fuel.

What is the current stage of our Sun in its lifecycle?

• Red Giant

• Main Sequence

• Supernova

• White Dwarf

What will happen to the Sun after it exhausts its hydrogen fuel?

• It will become a black hole.

• It will expand into a red giant.

• It will explode as a supernova.

• It will remain unchanged.

What is the Chandrasekhar limit?

• The time it takes for a star to become a red giant.

• The maximum mass a star can have to become a white dwarf.

• The minimum temperature for hydrogen fusion.

• The distance at which stars become invisible.

What determines whether a massive star becomes a neutron star or a black hole?

• The star's distance from Earth.

• The mass of the star's core.

• The star's initial size.

• The star's temperature.

What is the Oppenheimer-Volkoff limit?

• The maximum mass for a white dwarf.

• The mass limit between neutron stars and black holes.

• The minimum size for a supernova.

• The temperature at which stars explode.

What happens to light near a black hole?

• It becomes visible to the naked eye.

• It changes color.

• It speeds up and escapes.

• It bends and spirals inward.

What is the final stage of a star with a core mass less than 1.4 times the mass of the Sun?

• Red Giant

• White Dwarf

• Black Hole

• Neutron Star