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When a star expands and its outer layers cool, it becomes a red giant. This occurs in the later stages of a star's life cycle, particularly for stars with masses similar to the Sun. The expansion is caused by the star running out of hydrogen fuel in its core and beginning to fuse helium into heavier elements.
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There is enough fuel remaining in the sun to last for another?
Roughly 5 billion years. It will expand into a red giant followed by throwing off its outer layers forming a planetary nebula. The only thing left over will be the extremely hot core that will cool into a white dwarf over billions of years.
What forms when a main sequence star that had been contracting suddenly expands and cools?
When a main sequence star that has been contracting suddenly expands and cools, it can transform into a red giant. This phase occurs as the star exhausts its hydrogen fuel in the core, leading to gravitational collapse and subsequent heating, which causes the outer layers to expand and cool. During this process, the star's outer envelope becomes much larger and redder, while the core may start fusing helium or heavier elements, depending on the star's mass. Eventually, the star may shed its outer layers, leading to the formation of a planetary nebula or, in more massive stars, a supernova.
Which star expands due to fusion?
As a star ages and runs out of fuel in its core, it can expand in size as it transitions into a red giant. During this phase, fusion reactions occur in the outer layers of the star, causing it to expand and cool. This expansion happens when the star exhausts its hydrogen fuel and begins fusing helium in its core.
When do stars become red giants?
Stars become red giants when they have exhausted their hydrogen fuel in the core and start burning helium, causing the outer layers to expand and cool. This expansion turns the star into a large, cool, and luminous red giant.
What is the process that causes an aging star to swell up into a red giant?
As a star runs out of hydrogen fuel in its core, the core contracts and heats up, causing the outer layers of the star to expand and cool, turning the star into a red giant. This expansion is due to the increased radiation pressure from the core and the star's gravitational pull on its outer layers.
What is true of the layers of a star?
the inner layers are very cool, the outer layers are somewhat cool
What does a star become when it casts off hydrogen and helium gases in its outer layers?
When a star exhausts its hydrogen and helium in the outer layers, it can become a red giant and eventually shed those outer layers, leading to the formation of a planetary nebula. The core that remains can become a white dwarf, which is a dense, hot remnant that will gradually cool over time. This process marks the later stages of stellar evolution for medium-sized stars.
What describes the final phase in our sun's life cycle?
It will collapse and become a white dwarf.
Is a red giant a main sequence star?
No, a red giant is a star that has just left the hydrogen burning main sequence and begun the next step, burning helium. As helium undergoes fusion at a much higher temperature than hydrogen undergoes fusion, the star expands dramatically and as it expands its outer layers cool to red heat.
There is enough fuel remaining in the sun to last for another?
Roughly 5 billion years. It will expand into a red giant followed by throwing off its outer layers forming a planetary nebula. The only thing left over will be the extremely hot core that will cool into a white dwarf over billions of years.
Why glass breaks due to temperature change?
Glass isn't really a solid - it's a 'super-cooled liquid' - sudden temperature change causes 'thermal shock' where the outer surface expands or contracts quicker than the rest of the glass - causing it to break.
What forms when a main sequence star that had been contracting suddenly expands and cools?
When a main sequence star that has been contracting suddenly expands and cools, it can transform into a red giant. This phase occurs as the star exhausts its hydrogen fuel in the core, leading to gravitational collapse and subsequent heating, which causes the outer layers to expand and cool. During this process, the star's outer envelope becomes much larger and redder, while the core may start fusing helium or heavier elements, depending on the star's mass. Eventually, the star may shed its outer layers, leading to the formation of a planetary nebula or, in more massive stars, a supernova.
What temperature will the sun have when it gets really old?
As the sun expands late in it's life, it's outer shell will gradually cool and become redder. The sun's surface temperature right now is about 11-12,000 degrees Fahrenheit. It will gradually cool to about 5,600 - 6,000 degrees Fahrenheit toward the end of it's life.
Which star expands due to fusion?
As a star ages and runs out of fuel in its core, it can expand in size as it transitions into a red giant. During this phase, fusion reactions occur in the outer layers of the star, causing it to expand and cool. This expansion happens when the star exhausts its hydrogen fuel and begins fusing helium in its core.
When do stars become red giants?
Stars become red giants when they have exhausted their hydrogen fuel in the core and start burning helium, causing the outer layers to expand and cool. This expansion turns the star into a large, cool, and luminous red giant.
Will the sun be a white dwarf for the rest of eternity?
No, the sun will eventually evolve into a red giant before shedding its outer layers and becoming a white dwarf. The white dwarf stage marks the end of its evolution, where it will slowly cool down over billions of years.
What is onion skin weathering?
Onion skin weathering is a Geological process that happens mainly in deserts. As the rock heats up and expands by day, and cools and contracts by night, stress is often exerted on the outer layers. The stress causes the peeling off of the outer layers of rocks in thin sheets. Though this is caused mainly by temperature changes, thermal expansion is enhanced by the presence of moisture. Onion skin weathering has to do with rocks mostly in the desert. It is when the hot temperature of the day is then reduced to a cold temperature at night. This change in temperature causes layers of the rock to peel off like onion skin coming off. Therefore it is called onion skin weathering. Conclusion: Onion skin Weathering is when a rock heats up and expands (mostly deserts) And at night it cool and contract and layers of skin peels off
