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For stars on the main sequence, Hydrogen and helium.
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What elements are left after a star explodes?
All of them. A star begins to die when it creates Iron. Then it creates all the elements heavier than Iron. It has already created the elements lighter. Thus when the star explodes it spreads the elements it has created witch is all of them.
Why is the fusion of iron a problem for a star?
Unlike all lighter elements, fusing iron consumes more energy than it produces. Once a star's core starts iron fusion it stops producing energy and collapses. The collapse then blows away the outer layers of the star in a massive explosion called a supernova.
What happens to a star when hydrogen burns out?
The star first expands into a red giant (or a supergiant star if the original star was a giant star) and then explodes in a fusion flash (sun-size star), nova (slightly larger), or supernova (for a supergiant).
Why is hydrogen and helium found in all stars?
These elements are found in are very important in each of the five stars. all five stars because the elements
What happens during the third stage of a stars life cycle as the star uses up all of its hydrogen?
The core of a star contracts under the force of its own gravity. This contraction increases the temperature in the core.
What elements is found in betelgeuse's star?
All elements up to Iron are found in very star (except for very young stars as they have not reached that point yet). Though most of the elements are hydrogen and helium.
What is a star's core made out of?
A stars core is made up of mostly hydrogen. If you want the real numbers it is: 73% hydrogen, 25% helium, and the last 2% is all the other elements of the period table.
What elements are left after a star explodes?
All of them. A star begins to die when it creates Iron. Then it creates all the elements heavier than Iron. It has already created the elements lighter. Thus when the star explodes it spreads the elements it has created witch is all of them.
What is the source of all the elements in the universe that are more massive that iron?
The only thing that can fuse lighter elements into something heavier than iron is the explosion of a super-nova star. The problem is something called the "packing fraction". If you fuse light elements like hydrogen into heavier elements like helium, it generates energy; this is how a star works. When the star gets old, it collapses a little, heats up a LOT, and begins to fuse helium into carbon. This releases energy too, but not as much. As you fuse heavier and heavier elements, you get less and less energy out - until you get to iron. From the standpoint of nuclear reactions, iron is as "dense" as things get. Fuse elements together into something heavier than iron, and you must put energy IN to drive the reaction. So in a dying star, getting hotter and hotter and fusing heavier and heavier stuff, at some point it starts fusing iron - and this sucks energy OUT OF the star. Instead of the core of the star feeding energy out to the rest of the star, the core starts sucking energy from the rest of the star into the core, as iron becomes heavier elements like gold, lead, uranium, and even heavier exotic elements. So the middle levels of the star explode in two directions in the supernova - IN, to feed energy to the core to continue the generation of heavy elements, and OUT, to blow the remainder of the star into space. Some of the core elements collapse into a neutron star or a black hole, while the remainder of the core material is blown out into space. Millions or billions of years later, that gold dust or lead dust or uranium dust will fall into another planetary nebula, and form planets - planets like Earth. Every atom of ANYTHING heavier than helium has been through a star - and every atom heavier than iron has escaped from the core of a supernova explosion!
Point in stellar evolution when a star has used up all its fuel?
When a star has used up all the hydrogen in its core, it has reached the end of the main sequence. Subsequent developments depend on the mass and composition of the star. Sun-type stars may expand and continue to fuse ever heavier elements in and about their core, until fusion no longer yields sufficient energy to prevent collapse.
How many elements are in the star Sirius?
All of the elements in the periodic table
What kind of molecules are found in all living elements?
Proteins are found in all living elements.
What is a black hole's origin?
Scientists believe that a black hole is the result of the implosion of a supernova. At the end of the life of a very large star, the hydrogen fuel in the core becomes exhausted and the star begins to collapse. At some point, the pressure and temperature in the star become high enough to fuse helium into carbon and other heavier elements. (Our own Sun will go through a red giant phase in about 4 billion years.)But when the helium becomes depleted, the star will begin another contraction. The core of the star will be highly compressed and extremely hot, to the point that the carbon in the star's core will fuse into heavy elements. All kinds of elements will be fused into even heavier elements, producing titanic energies and causing even heavier elements to be created. At some point, elements like iron will be fused into very heavy elements like lead, gold, and uranium. At that point, the star will explode. Fusing iron into heavy elements doesn't produce energy; instead, it ABSORBS energy.The outer layers of the star will be thrown off into space, including vast quantities of every known element. But the core of the star will collapse to a point of density in which not even the nuclear forces in the atoms themselves can remain intact; it will collapse into a black hole.The heavy elements thrown off from the explosion will drift through space until they mix with other gas, and eventually fall into a new solar system. Every atom of matter in the Earth has already been through a supernova explosion; that's where the iron and lead and gold in the Earth came from.
How do most elements originate in the solar system?
With the exception of Hydrogen, all other elements in the solar system are manufactuered in the bowels of a star. And all elements heavier than iron have to be manufactured in the explosion of a supernova star.
Where did all the silicon in the Earth come from?
Silicon is an element, and was created in a star by fusion processes. Elements up to the mass of iron may be made in a star like our sun. For heavier elements, the energies found in a supernova are needed. Therefore, all of you comes from a star!!! Earth formed by accretion from bits of rubble that began as the gas & dust clouds of ancient supernovas.
What element does a star form once it loses fuel?
The answer will depend on what happens towards the end of its life. A supernova, for example, will form all sorts of elements - including all naturally occurring ones - up to uranium. At the other end a low mass star may collapse into an iron core.
What is the cataclysmic event called in which an exploding star produces all of the elements heavier than iron?
A supernova. It is an explosion that crushes the core of the star into a black hole or neutron star, and blasts all of the remaining mass of the star out into space. We know that our Sun is a 3rd generation star, because the Earth contains elements like iron, gold, lead, or uranium that can ONLY be produced in a supernova. And us? We're star-stuff; the iron atoms in our blood and the calcium atoms in our bones has already been through at least ONE supernova explosion.
