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  2. List of states of matter - Wikipedia

    en.wikipedia.org/wiki/List_of_states_of_matter

    Matter organizes into various phases or states of matter depending on its constituents and external factors like pressure and temperature. Except at extreme temperatures and pressures, atoms form the three classical states of matter: solid, liquid and gas.

  3. Big Bang nucleosynthesis - Wikipedia

    en.wikipedia.org/wiki/Big_Bang_nucleosynthesis

    Without major changes to the Big Bang theory itself, BBN will result in mass abundances of about 75% of hydrogen-1, about 25% helium-4, about 0.01% of deuterium and helium-3, trace amounts (on the order of 10 −10) of lithium, and negligible heavier elements. That the observed abundances in the universe are generally consistent with these ...

  4. State of matter - Wikipedia

    en.wikipedia.org/wiki/State_of_matter

    Quark matter or quantum chromodynamical (QCD) matter is a group of phases where the strong force is overcome and quarks are deconfined and free to move. Quark matter phases occur at extremely high densities or temperatures, and there are no known ways to produce them in equilibrium in the laboratory; in ordinary conditions, any quark matter ...

  5. Galaxy morphological classification - Wikipedia

    en.wikipedia.org/wiki/Galaxy_morphological...

    Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin Hubble and later expanded by Gérard de ...

  6. Radioactive decay - Wikipedia

    en.wikipedia.org/wiki/Radioactive_decay

    Today, the curie is defined as 3.7 × 10 10 disintegrations per second, so that 1 curie (Ci) = 3.7 × 10 10 Bq. For radiological protection purposes, although the United States Nuclear Regulatory Commission permits the use of the unit curie alongside SI units, [ 23 ] the European Union European units of measurement directives required that its ...

  7. Matter - Wikipedia

    en.wikipedia.org/wiki/Matter

    Download as PDF; Printable version ... Observational evidence of the early universe and the Big Bang theory require that this matter have energy and ... 2005epbb.book ...

  8. Nucleosynthesis - Wikipedia

    en.wikipedia.org/wiki/Nucleosynthesis

    According to current theories, the first nuclei were formed a few minutes after the Big Bang, through nuclear reactions in a process called Big Bang nucleosynthesis. [1] After about 20 minutes, the universe had expanded and cooled to a point at which these high-energy collisions among nucleons ended, so only the fastest and simplest reactions ...

  9. Island of stability - Wikipedia

    en.wikipedia.org/wiki/Island_of_stability

    Such a form of matter is theorized to be a ground state of baryonic matter with a greater binding energy per baryon than nuclear matter, favoring the decay of nuclear matter beyond this mass threshold into quark matter. If this state of matter exists, it could possibly be synthesized in the same fusion reactions leading to normal superheavy ...

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