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Why doesn't a star expand or collapse during the main sequence?
Wiki User
∙ 12y ago
A star remains relatively constant in size because the force of gravity is in equilibrium with the pressure caused by the fusion at the core.
Wiki User
∙ 12y ago
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What stage is our sun in right now?
Our sun is a main sequence (dwarf) star. It's expected to remain so for the next 5 billion years or so. After that it will expand briefly into a red giant, then collapse into a white dwarf.
How is Betelgeuse built?
Stars are formed when hydrogen molecular clouds collapse. The Sun, for example, is halfway through its main sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Stars without the mass to explode will enter the red giant phase, in which its outer layers expand as the hydrogen fuel in the core is consumed and the core contracts and heats up. Stars with more than about 10 solar masses after burning their hydrogen become red supergiants during their helium-burning phase. Betelgeuse is one such red supergiant and has formed in the same way.
What are the large cool stars that are not in the main sequence?
Large cool stars that are not in the main sequence are known as "red giants" or "red supergiants." These stars have exhausted the hydrogen fuel in their cores, causing their inner regions to contract while the outer layers expand. As a result, they become larger and cooler than when they were on the main sequence. Red giants are typically found in the later stages of stellar evolution, after they have exhausted their core hydrogen and started fusing helium in a shell around the core. They are often reddish in colordue to their lower surface temperature compared to main sequence stars. Red supergiants are even more massive and larger than red giants, representing the final stages of the life cycle of massive stars before they undergo supernova explosions or other dramatic events.
What is the main source of energy of a star as it grows in size to becomes a red giant?
A main sequence star burns hydrogen to helium. Once a main sequence star exhausts all of the hydrogen, it begins to expand and burn helium causing if to become a red giant.
What are some star types which are not main sequence stars?
Some examples of star types that are not part of the Main Sequence are:Red Giants, Blue Giants, Brown Dwarfs, and White Dwarfs.When stars are plotted on a chart that compares their Temperature (color) to their Brightness (Luminosity), most of them fall into a diagonal line across the chart.That chart is known as a Hertzsprung-Russell diagram and the diagonal line on it is called the Main Sequence of stars.Stars on the Main Sequence fit this pattern because they are in balance between collapse and expansion. Their gravity that is trying to collapse them is in balance with their nuclear fusion that is trying to expand them.A difference to notice between Main Sequence stars and other stars is:Main Sequence stars are dimmer if they are cooler and brighter if they are hotter.Giant stars are brighter whether they are hot or cool.Dwarf stars are dimmer whether they are hot or cool.
What stage is our sun in right now?
Our sun is a main sequence (dwarf) star. It's expected to remain so for the next 5 billion years or so. After that it will expand briefly into a red giant, then collapse into a white dwarf.
Which symbols do you use to expand and collapse the display of folder hierarchies?
+ and -
What can Business documents can include?
includes the ability to collapse or expand a document
Will the sun expand?
It will indeed expand to a red giant in about 5 billion years. It will then subsequently collapse to a white then brown dwarf star.
Can a star be born whenever a nebula expands?
No. Stars are born when nebulae collapse, not when they expand.
What does acid rain do to metals?
over a period of time it will make the metal expand and will collapse if it is a bridge or something
What would occur if the intake exceeds the output?
The answer depends on the context. The container could overflow, expand without limit or expand to bursting.
Why do scientists think that the Quantum Vacuum Collapse would only take seconds to destroy the universe?
They don't. If such a vacuum collapse is even possible - which is not at all sure - the collapse could randomly start somewhere, and then expand either at the speed of light, or at a speed close to the speed of light.
Why would lungs collapse if you made a hole through the skin and muscle into thoracic activity?
The lungs has a negative pressure. When air enters that space, it fills in the lung cavity making the lungs unable to expand and collapse.
Why doesnt the abyss freeze?
there is to much preasure down there. ice has to have a way to expand when it frezes. if there is too much water on top of it, it cant expand because of all of the weight.
What happens to rocks during the day?
during the day the rocks expand
What doesnt have a fixed shape or volume?
Gases do not have a fixed shape or volume; they expand to completely fill the container they occupy.
