Sylvie Willis
The sun is the engine that powers life on Earth, providing light, warmth, and the conditions necessary for our existence. However, it will not last forever. In about 5 billion years, the sun will run out of hydrogen fuel, marking the end of its main sequence phase. As the sun loses hydrogen, its fuel-holding core shrinks, allowing the outer layers to contract towards the center. This puts more pressure on the core, which responds by increasing the rate at which it fuses hydrogen into helium. This means that the sun will get brighter with time. Eventually, the sun will become a red giant so large that it will engulf our planet. However, the Earth will become uninhabitable much sooner than that. After about 1 billion years, the sun will be 10% brighter, triggering a greenhouse effect and causing our oceans to evaporate.
| Characteristics | Values |
|---|---|
| Sun's fuel remaining | 5 billion years |
| Sun's lifespan | 7-8 billion years |
| Sun's death | Red Giant phase, White Dwarf phase, Black Dwarf phase |
| Sun's fuel type | Hydrogen |
| Sun's fuel reserve | 100 times the mass of the Earth |
| Sun's luminosity increase | 1% every 100 million years |
| Sun's luminosity in 1.1 billion years | 10% brighter |
| Sun's size increase | 100 times its current size |
| Earth's habitability | 1 billion years |
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What You'll Learn
The sun has enough hydrogen fuel for another 5 billion years
The sun is the engine that powers life on Earth, providing light, warmth, and the conditions necessary for our existence. However, it will not last forever. The sun has enough hydrogen fuel for approximately another 5 billion years. This is because the sun is currently in the most stable part of its life, converting the hydrogen in its core into helium. This phase lasts a little over 8 billion years, and our solar system is just over 4.5 billion years old.
As the sun loses hydrogen, its fuel-holding core shrinks, allowing the outer layers to contract towards the centre. This puts more pressure on the core, which responds by increasing the rate at which it fuses hydrogen into helium. This means that the sun will get brighter with time. Scientists estimate that the sun's luminosity increases by 1% every 100 million years.
After about 1 billion years, the sun will be 10% brighter, triggering a greenhouse effect on Earth similar to the warming that made Venus into a hellish planet. The oceans will evaporate, and the water held in the highest parts of our atmosphere will be bombarded by high-energy light from the sun, splitting water into hydrogen and oxygen. This will eventually bleed the Earth dry of water.
Once the sun runs out of hydrogen, it will enter its "Red Giant" phase, growing so large that it will encompass the orbits of Venus and Mercury and possibly Earth. The sun will then expel its outer layers and contract into a white dwarf, which is the final state of low-mass stars. As a white dwarf, the sun will slowly cool and fade away to lower and lower temperatures.
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The sun will slowly turn up the heat on Earth
The sun, the engine that powers life on Earth, currently has about 5 billion years of life left. As it slowly loses its hydrogen fuel, its core shrinks, allowing the outer layers to contract towards the centre. This increases the pressure on the core, which responds by burning the remaining hydrogen at a faster rate, causing the sun to get brighter with time. This means that the sun will slowly turn up the heat on Earth.
Scientists estimate that the sun's luminosity increases by 1% every 100 million years. Compared to when it turned into a G-type main-sequence star 4.5 billion years ago, the sun is now 30% more luminous. In about 1 billion years, the sun will be 10% brighter, triggering a greenhouse effect on Earth similar to the warming that made Venus an uninhabitable planet. This will cause the evaporation of our oceans, and as the atmosphere becomes saturated with water, the water in the highest parts of our atmosphere will be bombarded by high-energy light from the sun, splitting apart the molecules and allowing the water to escape as hydrogen and oxygen. Eventually, this will leave Earth dry of water.
After the sun runs out of hydrogen, it will enter its ""Red Giant" phase, growing so large that it will encompass the orbits of Venus and Mercury, and possibly Earth. Some astronomers estimate it might grow to 100 times its current size. Even if life on Earth survives the tail-end of the sun's main sequence, it will certainly be destroyed by a Red Giant so large it will touch our planet.
Eventually, the sun will end its life as a white dwarf, a dead star that has exhausted all the nuclear fuel it is capable of burning. As a white dwarf, it will slowly cool and fade away to lower and lower temperatures.
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The sun will become a red giant
The sun is currently in the most stable phase of its life, converting the hydrogen in its core into helium. This phase will last about 8 billion years in total, and our solar system is just over halfway through it. However, life on Earth may only have about 1 billion years left, as the sun will become hot enough to boil our oceans. As the sun's core runs out of hydrogen, it will start burning hydrogen in a shell around the dead core, which is still full of helium. This will cause the sun to become a red giant, expanding in size and increasing in brightness. The sun will grow so large that it will likely swallow Mercury, Venus, and possibly Earth.
The sun will enter its "Red Giant" phase in about 5 billion years when it runs out of hydrogen fuel, marking the end of its main sequence phase. The helium in the sun's core will become unstable and collapse under its own weight. As the core contracts, it will heat up and eventually start fusing helium into carbon, and then carbon and helium into oxygen, neon, and helium into magnesium, and so on until it reaches iron. The outer layers of the sun will expand due to the gravitational forces compressing the core, causing the sun to grow in size and brightness.
The end of the red giant phase is typically the most violent time in a star's life. The bloated star will throw out material from its outer layers in intense episodic bursts. In our solar system, the sun will expand so much that it will swallow Mercury and Venus and possibly Earth. After the red giant phase, the sun will expel its outer layers and contract into a white dwarf, which is the final state of low-mass stars. The white dwarf will slowly cool and fade away to lower and lower temperatures.
While the sun's transformation into a red giant is inevitable, it is important to note that it will not happen for another 5 billion years. By that time, humanity may have evolved into something entirely different or become extinct. Additionally, the expansion of the sun may provide new opportunities for life in our solar system, as frozen planets that are currently too cold to host life may thaw and become habitable.
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The sun will eventually become a white dwarf
The sun is the engine that powers life on Earth, providing light, warmth, and the conditions necessary for our existence. However, it will not last forever. In about 5 billion years, the sun will run out of hydrogen fuel, marking the end of its main sequence phase.
When the sun's hydrogen fuel is depleted, it will begin to fuse helium into carbon, then carbon and helium into oxygen, neon, and helium into magnesium, and so on until it reaches iron. As the sun's fuel-holding core shrinks, its outer layers will contract towards the center, increasing the pressure on the core and causing it to fuse hydrogen at a faster rate. This will result in the sun becoming brighter and bigger. It will grow so large that it will engulf the orbits of Mercury and Venus and possibly Earth.
After the sun expands into a red giant, it will expel its outer layers and contract into a white dwarf. This is the final stage of low-mass stars like the sun. As a white dwarf, the sun will be no larger than the Earth but incredibly dense, slowly cooling and fading away to lower and lower temperatures.
The sun's transformation into a white dwarf will mark the end of its life, and it will no longer be able to sustain the conditions necessary for life on Earth. While this moment is still far in the future, it underscores the finite nature of the sun's fuel supply and the eventual need for alternative sources of energy to sustain life.
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The sun will not go out with a bang
The sun is the engine that powers life on Earth, providing light, warmth, and the conditions necessary for our existence. However, it won't last forever. The star is currently in the main sequence phase of its life, steadily converting hydrogen to helium through nuclear fusion in its core. This phase is expected to last for about 5 billion years, and the sun will not go out with a bang.
Once the hydrogen runs out, the sun will begin to swell. It will become a "red giant", growing so large that it will engulf Mercury, Venus, and Earth. It may even overtake more of the planets. This process of expansion is caused by the compression of the star's core, which increases the brightness of the sun. The surface cools down and goes from white-hot to red-hot.
After this, the sun will lose many of its outer layers and eventually shrink to become a "white dwarf". This is the final state of low-mass stars, including our sun. White dwarf stars are still very hot, but not as hot as the sun is now. The star will slowly cool and fade away to lower and lower temperatures, becoming a "black dwarf" where very little is left of its original form.
Scientists estimate that the sun has about 5 billion years of life left, and humanity may well be long gone by then. Our sun isn't massive enough to trigger a supernova when it dies, and it won't become a black hole either. Instead, the sun will fade into cosmic retirement, slowly cooling and fading away over billions of years.
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Frequently asked questions
The sun has enough hydrogen fuel to last another 5 billion years.
The sun will begin to die when it runs out of hydrogen fuel. It will then become a "red giant", expanding to a size that will likely engulf the Earth. Eventually, it will shed its outer layers to leave behind a cooling white dwarf.
In around 1 billion years, the sun will be 10% brighter, triggering a greenhouse effect and causing the oceans to evaporate. This will make Earth uninhabitable.
The sun will grow so large that it will swallow up Mercury and Venus, and possibly Earth.
