The main results are: Hydrogen cannot be formed in any part of the actual universe;it must come from the Big Bang. Helium and a little bit of lithium can have a cosmological origin associated to the Big Bang nucleosynthesis and the recombination process. The elements with an atomic number ...
In this chapter, the origins of elements are discussed. After the Big Bang 13.8 billion years ago, hydrogen and helium were formed. Stars were formed from these two elements. The star is sustained by three forces: (1) swelling by energy produced by nuclear reactions; (2) gravity produced ...
" Zylstra said, "and that's a totally different scenario from what happens in a star or in the universe during the Big Bang. Those are plasma systems; those reactions happen in a plasma in the universe."
Rather than being created solely during supernova explosions, chemical elements could also be produced deep within the Earth’s lower mantle. It has long been theorized that hydrogen, helium, and lithium were the only chemical elements in existence during theBig Bangwhen the...
Imprints of fast-rotating massive stars in the Galactic Bulge The first stars that formed after the Big Bang were probably massive, and they provided the Universe with the first elements heavier than helium ('metals')... C Chiappini,U Frischknecht,G Meynet,... - 《Nature》 被引量: 62发表...
in magnets or lasers, lead or lithium in batteries, and also of naturally occurring uranium and plutonium? The answer lies in the skies. Astrophysical environments from the Big Bang to stars and stellar explosions are the cauldrons where all these elements are made. The papers by Burbidge (...
comprehensive insight into the nuclear history of the Universe and related topics: starting from the Big Bang, when the ashes from the primordial explosion were transformed to hydrogen, helium, and few trace elements, to the rich variety of nucleosynthesis mechanisms and sites in the Universe. ...
How many stars are there in the universe?(不需要准确数字)Where do they come from and where do they go to?What is the most common chemical element in the universe?How are all the other chemical elements formed?Define the terms:Galaxy,nebula,black hole,supernova,comet,asteroid,meteorite(这题...
Elemental hydrogen was first formed about 380,000 years after the Big Bang once the universe had cooled sufficiently to allow protons and electrons to... Learn more about this topic: Nuclear Fusion in Stars | Overview & Process from Chapter 20/ Lesson 7 ...
preformation, theory of preformation - a theory (popular in the 18th century and now discredited) that an individual develops by simple enlargement of a tiny fully formed organism (a homunculus) that exists in the germ cell scientific theory - a theory that explains scientific observations; "sci...