Life Cycle of Stars

The video explains the life cycle of a low-mass star, starting from a nebula, forming a protostar, and undergoing nuclear fusion to become a main sequence star. As hydrogen depletes, the star expands into a red giant, eventually forming a planetary nebula. The core stabilizes into a white dwarf, which remains indefinitely due to its stable state.

What is the initial stage in the life cycle of a star?

• White Dwarf

• Red Giant

• Nebula

• Main Sequence

What process provides energy to a star during the protostar phase?

• Nuclear fission

• Nuclear fusion

• Chemical reaction

• Gravitational collapse

During which phase does a star spend most of its life?

• Protostar

• Red Giant

• Main Sequence

• White Dwarf

What happens to a star when it becomes a red giant?

• It shrinks and heats up

• It explodes

• It expands and cools down

• It remains the same size but changes color

What element is primarily produced during the red giant phase?

• Helium

• Oxygen

• Carbon

• Iron

What is formed when the outer layers of a red giant are shed?

• Black Hole

• Supernova

• Planetary Nebula

• Neutron Star

What is the final stage of a low-mass star's life cycle?

• Neutron Star

• Black Hole

• White Dwarf

• Red Giant

What keeps a white dwarf stable despite its high gravity?

• Electron pressure

• Rotational speed

• Nuclear fusion

• Magnetic fields

How does the mass of a white dwarf compare to Earth?

• It is less than Earth's mass

• It is three thousand times Earth's mass

• It is three times Earth's mass

• It is similar to Earth's mass

What is the primary reason a white dwarf does not undergo nuclear fusion?

• Lack of sufficient pressure

• Lack of sufficient temperature

• Lack of helium

• Lack of hydrogen