Question

Arrange the phases in the life cycle of the Sun in order from the birth of the Sun to the time in the far distant future when the Sun has cooled.

Answer 1

The Sun's life cycle includes the phases: Stellar Nebula, Protostar, Main Sequence, Red Giant, Planetary Nebula, White Dwarf, and finally Black Dwarf, depicting its journey from birth to cooling.

Step-by-step explanation:

The Sun, like all stars, has a life cycle that can be arranged into phases from its birth to its eventual cooling as a dead star. The phases in the life cycle of the Sun, in order, are:

1. Stellar Nebula: A large cloud of gas and dust.
2. Protostar: The phase when the nebula collapses and starts to form a star.
3. Main Sequence: The Sun spends most of its life in this stable phase, fusing hydrogen into helium in its core.
4. Red Giant: The Sun will expand and cool as it runs out of hydrogen and starts fusing helium.
5. Planetary Nebula: The outer layers of the Sun are expelled, leaving behind the core.
6. White Dwarf: The remaining core will radiate heat but will no longer undergo fusion.
7. Black Dwarf: The white dwarf cools over billions of years to become a black dwarf, which is no longer visible.
   

The Sun took its place on the main sequence approximately 4.5 billion years ago. Over time, it has undergone changes in its core, depleting its hydrogen supply, which leads to changes in size, temperature, and brightness. Understanding these phases provides insight into the future of the Earth and the ultimate fate of our Sun.

Answer 2

The following signifies the life cycle of the Sun:

a. Cast off the matter as planetary nebula.

b. The process of nuclear fusion starts at its core.

c. It appears in the form of a yellow star, as observed in the present time.

d. After that, it moves into a red giant star stage.

e. Converts into a white dwarf.

f. Turns into a black dwarf.

The Sun has initiated its life like any other kind of star, that is, from the gas and dust in a twirling cloud. The particles come close to each other and get condensed, unless and until there is sufficient pressure for the beginning of the nuclear fusion.

The Sun is in the middle of its lifespan and is presently in the prime sequence phase. At this phase, in its life the Sun combines hydrogen and helium. It is estimated that about 50 percent of the core hydrogen has been used so far.