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the North star
Any star that is in its red giant phase, as the fusion of helium creates so much energy that the star expands. Betelgeuse in the constellation Orion (bright star located on Orion's right "shoulder") is an excellent example.
What else can I help you with?
What is the name for the portion of a star's life cycle when it uses hydrogen for fuel?
The portion of a star's life cycle when it uses hydrogen for fuel is called the main sequence stage. During this stage, the star fuses hydrogen to form helium in its core, releasing energy in the process. This is the longest and most stable stage in a star's life.
What star uses helium for fuel and has expanding outer layers?
Most stars use hydrogen as their fuel, fusing the hydrogen nuclei into helium and radiating the energy that this releases. The helium acts as a sort of "nuclear ashes" in the solar fireplace. When a star grows old, the amount of helium "ash" in the core of the star begins to interfere with the hydrogen fusion, and the star begins to collapse. The collapsing star generates heat through the increasing pressure and density of the core, and at some point, the helium in the core gets so hot and so dense that the helium itself begins to fuse into carbon and oxygen. At that point, the star expands into a red giant. Very much like the Sun itself will, in about 4 billion years.
How do black holes happen?
It happens when a star 8 times bigger than the sun(if the star is bigger it uses up more fuel/hydrogen)starts to run out of fuel and turns helium into heavier elements and when it finally reaches iron it collapses and turn into a neutron star, then a black hole.
Why does an old main sequence star have more helium than a young main sequence star?
Stars convert hydrogen into helium over time.However, please note that they do so at very different rates; a massive star burns its fuel (hydrogen) much faster than a less massive star - so you can well have a massive star, which is only a few million years old, but which already burnt much of its fuel.
What are the main gases of a star?
It varies, depending on the star. In most stars, the most common gas is hydrogen, followed by helium. These are also currently the most common elements in the Universe; but as the Universe uses up its fuel, this situation will change.
What is formed once a star's core uses up its supply of helium?
a black hole
What is the name of the portion of a stars life were it uses hydrogen as fuel?
A star that uses hydrogen as fuel is a main sequencestar.
True or false as a star ages its internal composition changes as a result of rising temperature?
True. As a star ages and uses up its nuclear fuel, the core temperature increases, leading to changes in its internal composition. For example, nuclear fusion reactions in the core can convert hydrogen into helium, and then helium into heavier elements like carbon, oxygen, and eventually iron.
What happens when a star uses its hydrogen?
When a star uses the hydrogen in its core it will start burning hydrogen in a shell around the core and become a red giant. After that the star will either collapse into a white dwarf or start fusing helium, depending on its mass.
What is a large star that has the word red in it?
A Red Giant occurs when a star like our sun runs out of hydrogen to burn, so it uses helium. Helium is harder to fuse, so the star swells and expands, turning red. Eventually, the star runs out of helium, and shrinks down into a white dwarf, a teaspoons worth of white dwarf matter would weigh as much as an Elephant on Earth.
What are the fuel sources for the sun?
The primary fuel source for the sun is hydrogen, which undergoes nuclear fusion to form helium. This process releases a tremendous amount of energy in the form of light and heat. The sun converts about 4 million tons of mass into energy every second.
Why is the sun or the star eventually die?
A star eventually uses up all of it's hydrogen in nuclear fusion. They fusion of hydrogen into helium is what makes the star glow bright and hot. When all the helium is fused, the star collapses inward on itself, and becomes a small "white dwarf" star, essentially a pile of "stellar embers". That's the end of a star's life.
