(1) When a star exhausts the hydrogen in its core, it becomes a giant or supergiant. Once a star has used up all the hydrogen in its core, fusion of hydrogen into helium stops. (2) Fusion shell: Releases energy as it fuses hydrogen into helium.28-Jan-2020
What happens to a star when it exhausts its fuel?
- Stars die because they exhaust their nuclear fuel. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
What happens as a star begins to exhaust its core hydrogen supply?
(1) When a star exhausts the hydrogen in its core, it becomes a giant or supergiant. Once a star has used up all the hydrogen in its core, fusion of hydrogen into helium stops. The core starts to contract again (just as it contracted as a protostar, before hydrogen fusion began ).
What happens when a star stops fusing hydrogen in the core?
A star remains on the main sequence as long as there is hydrogen in its core that it can fuse into helium. Eventually the hydrogen fuel in the core runs out and fusion stops, shutting off the outward radiation pressure.
What happens to a star after it exhausts its core hydrogen quizlet?
When a red giant star exhausts its core hydrogen fuel, the core contracts but the star expands as a whole. However, the shell of hydrogen outside the core heats up to very high temperatures (hotter than the core during the main-sequence phase), and hydrogen fusion is occurring quickly.
Which stage lasts the longest?
During interphase, the cell undergoes normal growth processes while also preparing for cell division. It is the longest phase of the cell cycle, cell spends approximately 90% of its time in this phase.
What will happen if a low mass star runs out of hydrogen fuel?
When a main sequence star begins to run out of hydrogen fuel, the star becomes a red giant or a red super giant. THE DEATH OF A LOW OR MEDIUM MASS STAR After a low or medium mass or star has become a red giant the outer parts grow bigger and drift into space, forming a cloud of gas called a planetary nebula.
What happens if a star dies?
When the helium fuel runs out, the core will expand and cool. The upper layers will expand and eject material that will collect around the dying star to form a planetary nebula. Finally, the core will cool into a white dwarf and then eventually into a black dwarf. This entire process will take a few billion years.
Why does a star die?
Stars die because they exhaust their nuclear fuel. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
When the core of a star shrinks after hydrogen fusion stops?
When the core of a star shrinks after hydrogen fusion stops – the core cools and the star expands. Which of the following nuclear fuels does a one star use over the course of its entire evolution- hydrogen.
Which star spends the longest time in the Protostellar phase of life?
Calculate the Price
|What do we mean by the interstellar medium?||the gas and dust that lies in between the stars in the Milky Way galaxy|
|Which star spends the longest time in the protostellar phase of life?||a 1 solar mass star|
What happens to the core of a star after a planetary nebula forms?
As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf. If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star.
Which is more common a star blows up as a supernova?
Which is more common: a star blows up as a supernova, or a star forms a planetary nebula/white dwarf system? Planetary nebula formation is more common. This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death.
Why are main sequence lifetimes shorter for more massive stars?
All main – sequence stars are made of the same stuff, mainly H and He. So why do massive stars have shorter lifetimes? After all, they have more fuel to burn. A star with 60 times the mass of the Sun has 60 times as much nuclear fuel as the Sun, but burns it H more rapidly.
What can we learn about a star from a life track on an HR diagram?
5) What can we learn about a star from a life track on an H-R diagram? Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core.
What happens to the material left over from the death of a star?
The star stops producing energy and dies, but in those final stages it sheds its outer layers. This material blows out into interstellar space, carrying with it traces of the heavier elements it once formed, primarily carbon.