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each star is made up of hydrogen and the source of energy and heat in stars is nuclear fusion of hydogen nuclei into helium at a tempreature of around 6 m celsius.after a particular period when all the hydrogen will be converted into helium then because of intense gravitational pull the star will begun to collapse under its own gravity and at a particular tempreature again the fusion of helium into lithium starts this phase of sun is known as white dwarf. if the weight of any star is equivalent to the mass of our sun then that star will enter into white dwarf phase after red giant phase, and if the mass of staris more than the mass of sun then after redgiant phase star will change into neutron star or pulsar and then finally end up as blaack hole.for e.g black hole observed in sirius constellation 100 light years far from earth

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15y ago
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4mo ago

Changes in a star can be caused by processes such as nuclear fusion in its core, which generates energy and causes the star to shine. As a star ages, it can run out of fuel and experience changes in its structure, leading to events like expansion or contraction. External factors such as gravitational interactions with other stars or the impact of stellar winds can also influence a star's evolution.

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14y ago

small stars like our sun will die because the molecular fusion inside of them will increase for a while, increasing the sun's mass, then gravity will overpower the sun and crush it into a white dwarf star. big red supergiants like Betelgeuse will have a huge gravitational force, fusing not just H into He, but He is fused into Be and that is fused into O which is fused into S which is fused into Fe which is so heavy that it kills the star in a supernova leaving only a neutron star.

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14y ago

The stars dies when it runs out of helium and either causes supernova or becoming a white dwarf.

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Q: What causes the changes in a star?
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Continue Learning about Astronomy

A star whose brightness changes?

The brightness changes of a star could indicate that it is a variable star. This variability can be caused by factors such as pulsations, eclipses in a binary system, or changes in stellar activity. Studying variable stars can provide valuable information about their properties and evolution.


Why does a star wobble?

A star wobbles due to the gravitational pull of orbiting planets or other objects. This causes a slight shift in the star's position as it is pulled back and forth. Scientists can detect this wobble through changes in the star's spectrum, which helps them infer the presence of orbiting objects.


What is a variable star?

A variable star is a star whose brightness changes over time, either regularly or irregularly. These changes can be caused by various reasons, such as pulsations in the star's atmosphere, eclipses in binary star systems, or changes in the star's rate of nuclear fusion. Studying variable stars can provide valuable information about stellar properties and evolution.


What kind of star is a pulsating star?

A pulsating star is a type of variable star that changes in brightness due to periodic expansions and contractions of its outer layers. These changes can be regular or irregular, and the star's size and temperature vary over time. Examples of pulsating stars include Cepheid variables and RR Lyrae stars.


How does revolution effect seasons?

Revolution refers to the Earth's orbit around the Sun, which affects seasons by causing changes in the angle and intensity of sunlight reaching different parts of the Earth at different times of the year. This results in variations in temperature and day length, leading to the different seasons we experience.

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