Nuclear fusion
Heavier atoms which could not be formed as a result of fusion are produced as the result of a star that has run out of fuel exploding. It essentially forces atoms which do not release energy to fuse together.
As heavier elements are formed by fusion in the core, a massive star will eventually exhaust its nuclear fuel and trigger a supernova explosion. This explosion will generate immense energy, leading to the production and dispersal of even more heavy elements into space.
Well, Helium is an element, and "substance" can mean a combination of elements and compounds... which are formed according to their chemical properties. Assuming you were asking about pure elements, rather than substances, all elements up to Iron-56 are formed by nuclear fusion, presumably inside of stars. This is due to to Iron-56 being the most stable nucleus in the periodic table. Hydrogen-1 forms Helium-4, Helium combines to form Beryllium-8, Carbon-12, and Oxygen-16. And so on.... up to Iron-56. Fusion of heavier compounds will not result in excess energy (e.g. a star's heat and light) so those nuclear reactions will not sustain a star. Therefore, all elements heavier then Iron-56 are formed by the extraordinary conditions of a super nova. Because earth has abundant elements heavier than Iron-56, it is thought that the matter in our Solar System has been through several solar cycles... In other words, "we are all made of stars".
The three most common substances present in the solar nebula were hydrogen, helium, and small amounts of heavier elements such as carbon, oxygen, and nitrogen. Hydrogen and helium comprised the majority of the nebula's mass, accounting for about 98% of it. These elements formed the primordial gas from which the Sun and the solar system developed. The heavier elements, produced in earlier generations of stars, contributed to the formation of planets and other celestial bodies.
Heavier elements in the universe were formed through processes like nuclear fusion in the cores of stars, supernova explosions, and collisions between neutron stars. These events create the conditions necessary for the fusion of lighter elements into heavier ones.
Elements heavier than hydrogen are formed through nuclear fusion processes in stars. When lighter elements fuse together in the intense heat and pressure within a star's core, they can form heavier elements. This process continues throughout a star's life until elements up to iron are created. Elements heavier than iron are formed through supernova explosions or in the collisions of neutron stars.
Heavier elements are formed through nuclear fusion processes that take place in the core of a star. Hydrogen atoms undergo fusion to form helium, and then this process continues to create heavier elements by fusing helium atoms together. As the star fuses lighter elements, it produces heavier elements through a series of nuclear reactions.
hydrogen, helium, and a small amount (less than 2%) of heavier elements
Heavier elements are formed from hydrogen, the most abundant element in the universe, through a process called nuclear fusion. There are machines or structures in the universe that do this, and we call them stars. It is the process within stars, stellar nucleosynthesis, that allows heavier elements to be created up through iron. Elements heavier than iron are formed in supernova events. Use the links below to learn more.
I think it's our Sun which gets heavier elements from fusion of hydrogen and other light elements.Edit: Our Sun does create helium from hydrogen by fusion, but that's all. The reason it has heavier elements is that these come from the nebula that formed the Sun. The heavier elements are thought to have come from stars that exploded as "supernovas", a long time ago.
Chemical elements are formed in the Universe by stellar nucleosynthesis.
First hydrogen nuclei fuse to form helium, and then as the star ages heavier and heavier elements are formed.
Elements heavier than hydrogen and helium primarily formed in the cores of stars through nuclear fusion processes. Elements up to iron are formed in the cores of stars, while elements heavier than iron are typically produced in supernova explosions or neutron star mergers. These heavy elements are dispersed into space during these catastrophic events, enriching the interstellar medium from which new stars and planets can form.
The heavier elements in the universe were primarily formed through processes such as stellar nucleosynthesis and supernova explosions. In stars, nuclear fusion combines lighter elements like hydrogen and helium into heavier elements up to iron. Elements heavier than iron are typically formed during supernovae, where the intense energy and neutron capture processes create these elements. Additionally, some heavy elements may also form through the merging of neutron stars.
Nuclear fusion is the process by which lighter atoms combine to form heavier ones, releasing a large amount of energy. This process occurs in the cores of stars, where elements are formed through the fusion of hydrogen into helium and subsequently into heavier elements. The fusion reactions in stars are responsible for creating most of the elements found in the universe through nucleosynthesis.
Elements heavier than iron are formed in super-nova explosions.
Close, but not exactly. Hydrogen is not formed by nuclear reactions in stars, hydrogen was formed not long after the Big Bang, when the expanding universe had cooled sufficiently that an electron and a proton could combine to form a hydrogen atom. Helium and all the other elements that are heavier than hydrogen, were formed by the process of nuclear fusion, in stars.