Does the Sun currently shrink or expand?
The Sun, our life-giving star, undergoes constant changes in its size and energy output. However, the long-term trend is one of expansion.
The Sun is a massive ball of hot gas. Its size is determined by the balance between the inward pull of gravity and the outward pressure created by nuclear fusion in its core. Currently, the fusion rate is greater than the gravitational pull, causing the Sun to expand.
Over time, the Sun's core will eventually run out of hydrogen fuel. When this happens, the fusion rate will decrease, and the gravitational pull will become dominant. As a result, the Sun will begin to collapse, eventually becoming a white dwarf.
The Sun's expansion is a gradual process that occurs over billions of years. It is currently in a phase called the "main sequence," which is expected to last for another 5 billion years. During this time, the Sun will continue to expand at a rate of about 1% every 100 million years.
Related Questions:
- Why does the Sun expand?
- When will the Sun begin to collapse?
- How long will the Sun remain in the main sequence?
- What causes the Sun's expansion rate to vary?
- What will happen to the Earth when the Sun dies?
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