The Hadean (/ heɪˈdiːən, ˈheɪdiən / 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...

Jan 27, 2025 · The Hadean Eon is characterized by Earth’s initial formation—from the accretion of dust and gases and the frequent collisions of larger planetesimals—and by the stabilization of its core and crust and the development of its atmosphere and oceans.

From 4.6 to 4.0 billion years ago, the Hadean Eon is the first eon on Earth. Its key events are: HEAT SOURCE: Earth established a heat source with the sun. MAGNETIC FIELD: Convection currents produced a geodynamo. This was the first step for life to persist on Earth. MOON FORMATION: The formation of our moon was key to stabilizing our climate.

It is the unofficial geological period of time that lies just before the Archean time period. The Hadean began with the formation of the Earth roughly 4.5 billion years ago (Ga) and ended about 3.8 Ga; the latter date varies according to different sources.

Apr 11, 2024 · The Hadean was originally defined as the birth of the planet occurring 4.0 billion years ago and preceding the existence of many rocks and life forms. However, geologists have dated minerals at 4.4 billion years, with evidence that liquid water was present.

The Hadean Eon, named after the Greek god and ruler of the underworld, Hades, is the oldest eon and dates from 4.6-4.0 billion years ago. This time represents Earth’s earliest history, during which the planet was characterized by a partially molten surface, volcanism, and asteroid impacts.

May 21, 2024 · The Hadean eon refers to the earliest geological epoch of Earth’s history, from the formation of the planet about 4.5 billion years ago, to the beginning of the Archean period, 3.8 billion years ago. The name “Hadean eon” is derived from the word Hades, the Greek word for Hell or “unseen”.

The Hadean. Hadean time (4.6 to 4 billion years ago)* is not a geological period as such. No rocks on the Earth are this old, except for meteorites. During Hadean time, the Solar System was forming, probably within a large cloud of gas and dust around the sun, called an accretion disc.

Hadean Eon: Cryptic Period. Also known as the ‘Hidden’ period, this Cryptic period is described as the earliest phase of the Earth. This period is estimated to last from 4.56 to 4.50 billion years ago. It is named as ‘cryptic’ because the moon is also devoid of any preserved details of this time.

Oct 23, 2013 · The Hadean is the first geologic eon of Earth and lies before the Archean. It began with the formation of the Earth about 4600 million years ago and ended as defined by the ICS 4,000 million years ago.