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The Hadean (/ h eɪ ˈ d iː ə n, ˈ h eɪ d i ə n / hay-DEE-ən, HAY-dee-ən) is the first and oldest of the four known geologic eons of Earth's history, starting with the planet's formation about 4.6 billion years ago [4] [5] (estimated 4567.30 ± 0.16 million years ago [2] set by the age of the oldest solid material in the Solar System — protoplanetary disk dust particles — found as ...
In particular, it is sometimes found that the Hadean eon is subdivided into the Cryptic era and Basin Groups 1-9 (which collectively make up the Pre-Nectarian), and the Nectarian and Lower Imbrian. The first lifeforms (self replicating RNA molecules, see RNA world hypothesis ) may have evolved on earth around 4 bya during this era.
The siege of Tbilisi (627-628) was a siege by the Byzantine Empire and Western Turkic Khaganate in 627-628 against Prince Stephen I of Iberia, the Sasanid vassal ruler of Sasanian Iberia. Background [ edit ]
The Cryptic era is an informal term for the earliest geologic evolution of the Earth and Moon.It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun close to about 4.533 billion years ago when the Earth and Moon formed, and lasted to about 4.15 billion years ago.
Siege of Tbilisi (627–628) This page was last edited on 12 August 2021, at 21:20 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
Heraclius' campaign of 622, erroneously also known as the Battle of Issus, was a major campaign in the Byzantine–Sasanian War of 602–628 by emperor Heraclius that culminated in a crushing Byzantine victory in Anatolia.
Coin of king Ardashir III (c. 621–630). Year 628 was a leap year starting on Friday of the Julian calendar.The denomination 628 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
The Sasanian civil war of 628–632, also known as the Sasanian Interregnum was a conflict that broke out after the execution of the Sasanian king Khosrow II between the nobles of different factions, notably the Parthian (Pahlav) faction, the Persian (Parsig) faction, the Nimruzi faction, and the faction of general Shahrbaraz. Rapid turnover of ...