Our cosmic systems have always revolved around the Sun. However, with the development of modern astronomy, humanity have realized that the Sun is only one among many stars in our Universe. And what stage of the star life cycle is the sun in
Star of the main sequence.
The Sun is a main sequence star right now and will be for another 4-5 billion years. After that, it will expand and cool to become a red giant, then contract and heat up to become a white dwarf:
This indicates hydrogen was fused into helium in its core through nuclear fusion events. However, since the Sun’s core has a limited quantity of hydrogen, this process cannot continue indefinitely. It now contains more than 72% hydrogen.
The Sun will be 10% brighter than it is today in one billion years. This will provide a damp greenhouse effect on Earth, akin to the hellish Venus settings we already witness. Life as we know it will be impossible to live anywhere on the planet’s surface under these circumstances.
The Sun will run out of hydrogen fuel one day in the far future. The Sun will leave the main sequence stage of its existence in roughly 6.4 billion years, at which time this will begin. When the hydrogen in the core is depleted, the inner helium ash that has accumulated there becomes unstable and collapses under its own weight.
Outside its core, the helium will begin to fuse in a shell surrounding the dead core. Our star will thereafter enter the red giant phase and expand considerably more rapidly. The growing Sun is expected to become huge enough to span the orbits of Mercury, Venus, and maybe even Earth.
Everything has to come to an end. Massive supernovas and the birth of black holes are usually the first things that spring to mind when people think about stars dying. Our Sun, on the other hand, will not be able to do so because it is just not huge enough.
Around one billion years after the Sun attempts to devour Earth, a phenomenon known as Helium flash occurs, in which massive quantities of Helium are fused to Carbon in a matter of minutes. The star will shrink but gain brilliance once the Helium in the core begins fusion.
The Sun will thereafter become unstable and begin shedding mass via a sequence of thermal pulses over the following 20 million years. The Sun will launch wave after wave of material into space as a result of these intense bursts of radiation. The Sun will have thrown away half of its mass after 500,000 years of stellar tantrums.
That abandoned debris will create a stunning planetary nebula for a short time. The remnant will cool and ultimately become a white dwarf, consisting primarily of carbon and oxygen. Before fading to dark, this burning ember will light for billions of years.
Spectral type / G2V Sun
The Sun is classified as a yellow dwarf star in their classification scheme. This cluster of stars is rather tiny, with a mass of between 80% and 100% that of the Sun. As a result, the Sun is at the top of the list. G V star is the official designation.
Stars are celestial objects that generate their own energy by fusing gases together. They resemble light orbs that are circular, gas-burning, and produce energy. Our solar system’s star, the Sun, is a star because it generates energy via the fusion process of Helium into Hydrogen.
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