| 单词 |
ylem |
| 释义 |
ylem Astr.|ˈiːlɛm|
[f. med.L. hȳlem, acc. of hȳlē hyle.]
In the big-bang theory, the primordial matter of the universe, orig. conceived as composed of neutrons at high temperature and density.
[1390: see hyle.] 1948R. A. Alpher in Physical Rev. LXXIV. 1581/1 Very shortly after the beginning of the universal expansion, the ylem was a gas of neutrons only. [Note] According to Webster's New International Dictionary..the word ‘ylem’ is an obsolete noun meaning ‘The primordial substance from which the elements were formed.’ It seems highly desirable that a word of so appropriate a meaning be resurrected. 1954Sci. Amer. Mar. 61/2 As the Universe went on expanding and the temperature of ylem dropped, protons and neutrons began to stick together, forming deuterons..and heavier elements. 1959J. Blish Clash of Cymbals vii. 171 The ylem was the primordial flux of neutrons out of which all else emerged. 1974Frauenfelder & Henley Subatomic Physics xviii. 475 It is interpreted as the radiation that is left over from the primordial fireball and thus provides some information about the conditions in the ylem. |
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