Life Cycle of Stars

What is the process called when hydrogen atoms combine to form helium?

• Nuclear fission

• Nuclear fusion

• Chemical reaction

• Radioactive decay

What is a black dwarf?

• A type of star that is still in its main sequence phase.

• A theoretical stellar remnant that forms when a white dwarf cools down and no longer emits significant heat or light.

• A black hole that has absorbed a significant amount of matter.

• A star that has exploded in a supernova and left behind a neutron star.

What is the role of gravity in the life cycle of stars?

• Gravity causes the collapse of nebulae, leading to the formation of stars.

• Gravity prevents stars from forming by pushing them apart.

• Gravity has no significant effect on the life cycle of stars.

• Gravity only affects the orbits of planets around stars.

What is the initial stage of a star's life cycle?

• Nebula

• Red Giant

• Main Sequence

• White Dwarf

What is the difference between nuclear fusion and nuclear fission?

• Nuclear fusion splits a heavy nucleus into lighter nuclei, while nuclear fission combines light nuclei to form a heavier nucleus.

• Nuclear fusion combines light nuclei to form a heavier nucleus, while nuclear fission splits a heavy nucleus into lighter nuclei.

• Nuclear fusion involves the release of energy from heavy nuclei, while nuclear fission requires energy input.

• Nuclear fusion occurs only in stars, while nuclear fission can occur in nuclear reactors.

What is stellar nucleosynthesis?

• The process of creating elements within stars through nuclear fusion.

• A method of measuring the brightness of stars.

• The phenomenon of stars exploding as supernovae.

• The technique used to observe distant galaxies.

What is a white dwarf?

• A type of star that is still undergoing nuclear fusion.

• The remnant core of a star that has exhausted its nuclear fuel and shed its outer layers.

• A planet that has a white appearance due to its atmosphere.

• A large star that is in the process of becoming a supernova.

What happens when a nebula collapses under its own gravity?

• A protostar is formed.

• A black hole is created.

• A supernova occurs.

• A planet is born.

Do larger stars have a longer or shorter life cycle compared to smaller stars?

• Longer life cycle

• Shorter life cycle

• No difference in life cycle

• Depends on the star's composition

What is a planetary nebula?

• A type of galaxy formed from the remnants of a supernova explosion.

• An expanding shell of gas ejected from a star during the late stages of its life cycle.

• A dense cloud of gas and dust where new stars are born.

• A region in space where black holes are formed.