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The Sun is at this stable phase in its life. Red giant star When all the hydrogen has been used up in the fusion process, larger nuclei begin to form and the star may expand to become a red giant.
- Space Physics
The Sun is our nearest star. It is a relatively small star...
- Space Physics
Jan 30, 2023 · Today, approximately 4.5 billion years later, the Sun is still in the main sequence phase of its lifecycle, fusing hydrogen atoms together into helium to produce energy in the form of radiation including primarily heat and light. Our Sun, like other Yellow or Orange stars, is fairly average in size, temperature, and luminosity.
- The Birth of the Sun: According to Nebular Theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust. Then, about 4.57 billion years ago, something happened that caused the cloud to collapse.
- The Main Sequence: The Sun, like most stars in the Universe, is on the main sequence stage of its life, during which nuclear fusion reactions in its core fuse hydrogen into helium.
- Core Hydrogen Exhaustion: All things must end. That is true for us, that is true for the Earth, and that is true for the Sun. It’s not going to happen anytime soon, but one day in the distant future, the Sun will run out of hydrogen fuel and slowly slouch towards death.
- Final Phase and Death: Once it reaches the Red-Giant-Branch (RGB) phase, the Sun will haves approximately 120 million years of active life left. But much will happen in this amount of time.
A star, like the Sun, in its main sequence close main sequence A stable stage in the life cycle of a star. Nuclear fusion occurs, fusing hydrogen nuclei into helium nuclei. There is a balance ...
The Sun is currently a main sequence close main sequence A stable stage in the life cycle of a star. Nuclear fusion occurs, fusing hydrogen nuclei into helium nuclei. There is a balance between ...
The Sun formed about 4.6 billion years ago in a giant, spinning cloud of gas and dust called the solar nebula. As the nebula collapsed under its own gravity, it spun faster and flattened into a disk. Most of the nebula's material was pulled toward the center to form our Sun, which accounts for 99.8% of our solar system’s mass.
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As the Sun exhausts its hydrogen fuel, the core will shrink, causing the outer layers to expand and the Sun to swell into a red giant. During the red giant phase, the Sun’s luminosity will sharply increase, and it will engulf the inner planets as its outer envelope expands. The heat from the core will cause the outer layers of the Sun to ...
