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 by the huge body; and (3) repulsion produced by ...
The simplest chemical elements in the , hydrogen and helium, originally formed during the Big Bang. These are the most abundant elements out there. The cores of stars can make more helium through a process called nuclear fusion, where enough energy forces the centres of atoms together to make...
Immediately after the Big Bang, the universe was a dense soup of matter and energy. The temperature was around 1032Kelvin. The universe started inflating and simultaneously cooling off (though it was still trillions of Kelvin). The elementary particles (quarksand electrons) started popping into exi...
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 ...
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: 2011年 New abundances of planetary nebulae in the Galactic...
Astrophysical environments from the Big Bang to stars and stellar explosions are the cauldrons where all these elements are made. The papers by Burbidge (Rev Mod Phys 29:547–650, 1957) and Cameron (Publ Astron Soc Pac 69:201, 1957), as well as precursors by Bethe, von Weizsäcker, ...
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...
Let’s dive into the eight origin stories in more detail. The Big Bang The universe began as a hot, dense region of radiant energy about 14 billion years ago. It cooled and expanded immediately after formation, creating the lightest and most plentiful elements: hydrogen and helium. This proce...
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. ...
the star extremely likely. LUNA recreates the energy ranges of nuclear reactions and, with its accelerator, goes back in time to one hundred million years after the Big Bang, to the formation of the first stars and the start of those processes that gave rise to mysteries we still do not ...