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Hypothesize what will happen when the sun exhausts it's supply of hydrogen?
When a main sequence star, such as our sun, exhausts it's supply of Hydrogen, fusion of Hydrogen to Helium ceases in the core. This results in cooling of the core and therefore causes it to contract. As the core contracts, the layers surrounding the star gain kinetic energy until the fusion of Hydrogen is possible in the outer layers. As these layers undergo fusion, they increase in temperature dramatically. The outer layers expand due to heat, and the star becomes massive; the main sequence star has evolved into a red giant. Fusion of Hydrogen to Helium continues in the outer layers, whilst the fusion of heavier elements such as carbon occurs in the core.
Surface temperature of betelgeuse?
Surprisingly perhaps, it is fairly cool for a star. Betelgeuse is a red giant, meaning it is reaching the end of its life. When a star like our sun, a moderate Main Sequence Star begins to run out of fuel, there is a reaction in the collapsing core that briefly (in the lifetime of a star..briefly can be millions of years) causes the outer layers to expand outward. The gases cool off as they move farther from the core. Red light holds the least energy, which is why the star's outer layers turn red. It is also the coolest light. Our sun will one day become a red giant like Betelguese, and its outer layers will expand far enough to engulf Mars. One day, Betelgeuse will loose its outer layers in a nova, and all that will be left will be a white dwarf core. Look up the Hertsprung-Russell diagram and you'll get more exact temperatures for red giants, but red stars of any type are the coolest.
When a low mass star first runs short of hydrogen in its core it becomes brighter because?
Low mass stars become brighter after depleting hydrogen because all of the hydrogen in the core has been fused into helium. Once this happens, hydrogen fusion begins in the outer layers, which causes more heat and light generation.
Why does fusion occur in he sun's core but not in other layers?
Thermonuclear reactions only occur in the core of the star because that's where the heat and pressure is so great that it overcomes the forces between the atoms. The surface stars is relatively cool. The Sun is only around 10,000° F on its surface. well below the several million degrees required for fusion.
Describe the life cycle of a star like the Sun-?
Planetary Nebula are the outer layers of a star that are lost when the star changes from a red giant to a white dwarf. A star is a luminous globe of gas producing its own heat and light by nuclear reactions (nuclear fusion). They are born from nebulae and consist mostly of hydrogen and helium gas.
What is true of the layers of a star?
the inner layers are very cool, the outer layers are somewhat cool
When a star has no fuel left and it's outer layers escape into space it is what?
It is dead. It becomes a black dwarf, just a rock.
Medium size stars in the red giant phase become what?
After the Red Dwarf phase, the life of the star ends. It begins to shed its outer layers into a cloud, called a planetary nebula, until only about 20% of the star's mass remains. The star will then continue to cool and shrink until it becomes a White Dwarf.
When a star has exhausted its supply of hydrogen?
When hydrogen in the core of the star is depleted, a balance no longer exists between pressure and gravity. Core contracts, temperatures incrase. This causes outer layers to expand and cool. This star is called a GIANT.
Hypothesize what will happen when the sun exhausts it's supply of hydrogen?
When a main sequence star, such as our sun, exhausts it's supply of Hydrogen, fusion of Hydrogen to Helium ceases in the core. This results in cooling of the core and therefore causes it to contract. As the core contracts, the layers surrounding the star gain kinetic energy until the fusion of Hydrogen is possible in the outer layers. As these layers undergo fusion, they increase in temperature dramatically. The outer layers expand due to heat, and the star becomes massive; the main sequence star has evolved into a red giant. Fusion of Hydrogen to Helium continues in the outer layers, whilst the fusion of heavier elements such as carbon occurs in the core.
When a star has fuel left and its outer layers escape into space it is a?
It is called a nova.
What describes how a star's life cycle end?
The star will blow out its outer layers in a huge explosion called a supernova.
Does a neutron star heat or cool?
A neutron star is a degenerate star, it's initial heat will dissipate into outer space and thus it will cool over time.
What is the ejected outer layers of a dying low-mass star called?
planetary nebula
What is the ejected outer layers of a dying low-mass star call?
planetary nebula
When does a star form a nebula?
A star forms a nebula when it runs out of fuel. The star either becomes a red giant or a supergiant, then the star would be blown off into space either by expansion or explosion. The outer layers, which was released into space, would become a nebula, or sometimes a part of a larger nebula.
What type of temperature of the star if it is red?
Low temperature because red giants are star with low temperatures, but very bright. A star forms when a portion of a dense interstellar cloud of hydrogen and dust grains collapses from its own gravity. As the cloud condenses, its density and internal temperature increase until it is hot enough to trigger nuclear fusion in its core (if not, it becomes a brown dwarf). After hydrogen is exhausted in the core from nuclear burning, the core shrinks and heats up while the star's outer layers expand significantly and cool, and the star becomes a red giant.
