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They were formed in supernovae.
It is believed this was how the universe formed. Hydrogen fuses to form all the other heavier elements on the periodic table up to Element number 92
Elements that are formed in cool stars are heavy but not heavier than iron. (Elements that are heavier than iron are formed in a supernova.)
1) Hydrogen and some helium and a fairly small amount of lithium were formed very shortly after the start of the Universe, when matter cooled down enough for quarks to join into nucleons, and for some nucleons to join into heavier elements. There wasn't enough time to form any of the heavier elements.2) The heavier elements - the so-called metals - were formed inside of stars, by nuclear fusion. In some cases, significant amounts of this matter went back into space, in supernova explosions.For additional information, I suggest searching Wikipedia or Google for the following topics:NucleosynthesisSupernovaMetallicityNuclear fusion
All the compounds existing in the universe are formed.
They were formed in supernovae.
They were formed in supernovae.
a series of stars
a series of star cycles
Other elements were formed in stars by nucleosynthesis.
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.
Chemical elements are formed in the Universe by stellar nucleosynthesis.
It is believed this was how the universe formed. Hydrogen fuses to form all the other heavier elements on the periodic table up to Element number 92
Elements that are formed in cool stars are heavy but not heavier than iron. (Elements that are heavier than iron are formed in a supernova.)
Elements heavier than iron are formed in super-nova explosions.
Once the Universe got cold enough, atoms could form. It is believed that in the Big Bang, only hydrogen, helium, and small amounts of lithium formed; all heavier elements were formed later, through fusion in stars.Once the Universe got cold enough, atoms could form. It is believed that in the Big Bang, only hydrogen, helium, and small amounts of lithium formed; all heavier elements were formed later, through fusion in stars.Once the Universe got cold enough, atoms could form. It is believed that in the Big Bang, only hydrogen, helium, and small amounts of lithium formed; all heavier elements were formed later, through fusion in stars.Once the Universe got cold enough, atoms could form. It is believed that in the Big Bang, only hydrogen, helium, and small amounts of lithium formed; all heavier elements were formed later, through fusion in stars.
a series of stars