Stellar evolution is the life cycle of a star. A cycle suggests that upon death of a star, another star is born. How is this possible?

Stars never really die.
The death is a black dwarf star. This type of death triggers the birth of a new star.
The death is a red giant. This type of death emits red energy that forms a new star.
The death is a supernova. This type of death can produce nebular clouds and trigger the birth of a new star.

Stars never really die.

the death is a black dwarf

The correct answer is: The death is a supernova. This type of death can produce nebular clouds and trigger the birth of a new star.

When a massive star reaches the end of its life, it undergoes a supernova explosion. During this explosive event, the outer layers of the star are ejected into space, forming a cloud of gas and dust called a supernova remnant. These supernova remnants can eventually collapse under their own gravity, forming dense pockets of matter within the cloud.

Within these dense pockets, called nebular clouds, gravity causes the gas and dust to condense and contract. As the cloud continues to collapse, it begins to heat up due to the energy released by gravitational contraction. Eventually, the temperature and pressure in the center of the collapsing cloud become high enough to trigger nuclear fusion, igniting a new star.

So, when a star dies in a supernova, it can leave behind a nebula that can serve as the birthplace of new stars. This is how the cycle of stellar evolution continues, with the death of one star leading to the birth of another.

The correct answer is: The death is a supernova. This type of death can produce nebular clouds and trigger the birth of a new star.

When a massive star reaches the end of its life, it undergoes a catastrophic event called a supernova. A supernova is a powerful explosion that releases an enormous amount of energy and ejects the outer layers of the star into space. This process can generate shockwaves that compress nearby interstellar gas and dust, creating dense regions known as nebulae.

These nebulae can be a potential birthplace for new stars. As the shockwaves pass through the nebula, they can cause the gas and dust to collapse under gravity, forming clumps and eventually protostars. Over time, these protostars can gather more material and grow in size, eventually reaching a point where nuclear fusion ignites in their cores, and they become fully-fledged stars.

So, the death of a massive star in a supernova can actually trigger the birth of new stars by creating the conditions necessary for star formation within the surrounding nebular clouds. It is through this cycle of stellar death and birth that the Universe continues to populate with stars.