Hadean


Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to Hadean: Archean

Ha·de·an

 (hā-dē′ən, hā′dē-)
adj.
Of, relating to, or being the period of time during which Earth formed, from the start of the solar system (4.6 billion years ago) until accretion, impact, and cooling led to stable Earth-Moon orbits and the formation of the earliest rocks on Earth (3.8 billion years ago). See Table at geologic time.

[After Hades, (from the intense heat during part of this period).]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Hadean - the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
Adj.1.Hadean - of or relating to or characteristic of Hades or Tartarus
infernal - being of the underworld; "infernal regions"
Translations
Hadéen
References in periodicals archive ?
When the meteorites from the Hadean period, between 4 billion and 4.
According to the residents of Rawalpindi most congested and overcrowded area Landa Bazaar, Bhabara Bazaar, Chastain hadean, Tehli Mohalla, the sanitation staff visits their area after weeks and heaps of garbage remains piled up on sides of the roads creating an unbearable stench and giving rise to fears of epidemic diseases.
This is the Hadean internment of the harlot, with schoolmarm as registrar of the predictable damnation.
The new research reveals that asteroidal collisions not only severely altered the geology of the Hadean eon Earth, but likely also played a major role in the subsequent evolution of life on Earth as well.
Yet the male lover seems to find solace in the embrace of this Hadean femme fatale: "My love I call her, and she loves me well" (16).
The period is called Hadean eon after the Greek god of the underworld- Hades- for its hot and inhospitable atmosphere.
At present, geochronologists split Earth's history into four large eons: Hadean (4600-4000 Ma); Archean (4000-2500 Ma); Proterozoic (2500-541 Ma); and Phanerozoic (541 Mathe present).
The findings, in a paper titled "The oxidation state of Hadean magmas and implications for early Earth's atmosphere," have implications for our understanding of how and when life began on this planet and could begin elsewhere in the universe.
Brodsky's use of Hadean motifs--the subterranean bar and Lalo's role as a ghost--symbolizes an ironic twist on the Pinochetistas' claim that the military coup saved Chile from moral decay and general chaos.
Among specific topics are primordial massive supernovae as molecular factories at high redshifts, observational evidence for dust growth in proto-planetary discs, hydrous-carbonaceous meteoroids in the Hadean Aeon, dust in clusters of galaxies, probing dust with gamma-ray bursts, analogs of cosmic dust, intersteller ices, and interstellar dust models and evolutionary implications.
China's deposits are distributed mainly in Maoming, Hadean, Fushun, Longkou, etc.
That Late Heavy Bombardment melted most of Earth's surface rocks, erasing most terrestrial evidence of the Hadean epoch.