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n. (context physics astronomy cosmology now chiefly historical English) In the Big Bang theory, the hot and dense plasma of which the cosmos consisted at the time of recombination in an early stage of its expansion and cooling, when the first atoms formed and photons decoupled, the source of the cosmic background radiation.


n. (cosmology) the original matter that (according to the big bang theory) existed before the formation of the chemical elements


Ylem is a term that was used by George Gamow, Ralph Alpher, and their associates in the late 1940s for a hypothetical original substance or condensed state of matter, which became subatomic particles and elements as we understand them today. The term ylem was actually coined by Ralph Alpher.

In modern understanding, the "ylem" described as by Gamow was the primordial plasma, formed in baryogenesis, which underwent Big Bang nucleosynthesis and was opaque to radiation. Recombination of the charged plasma into neutral atoms made the Universe transparent at the age of 380,000 years, and the radiation released is still observable as cosmic microwave background radiation.

Ylem (album)

Ylem (pronounced e-lem) is the sixth full-length studio release from German melodic black metal band Dark Fortress; and the second to feature new vocalist Morean. The album was released on January 22, 2010 in Germany, Austria, Switzerland and on January 25, 2010 for the rest of Europe. It was also released on February 9, 2010 in the United States of America.

Ylem (Stockhausen)

Ylem is a composition by Karlheinz Stockhausen for a variable ensemble of 19 or more players, and is given the work number 37 in his catalogue of compositions.

Usage examples of "ylem".

Initially there was a substance -- call it Ylem, the Proto-atom, whatever -- that exploded and gave rise to matter and energy, stellar clouds, spiral galaxies, and dark and bright nebulae, all floating in rarefied gas filled with radiation.

According to this Sacred Physics book, the Big Bang Story that broke open the cosmic ylem egg showered out the Beings along with all the quarks and tachyons and all the rest of them.

The Beings came from a kind of impurity in the ylem, a sort of aesthetic flaw in the original story.

We offer the career of a lifetime to anyone interested in astronautics, biology, chemistry, dynamics, eugenics, ferromagnetism, geology, hydraulics, industrial administration, jet propulsion, kinetics, law, metallurgy, nucleonics, optics, patent rights, quarkology, robotics, synthesis, telecommunications, ultrasonics, vacuum technology, work, X-rays, ylem, zoology .

Suddenly space-time seethed with stripped atoms, and then with the primordial flux of neutrons, the ylem.