Scientists say they have dated an ancient crystal called a zircon to about 4.4 ... Eon” because it was thought to be “hell-like,” Valley said. The leading theory is that Earth was bombarded ...

And the earliest Eon is known as the Hadean. It begins with the very formation of the Earth itself, around 4.6 billion years ago and ends 4 billion years ago. And this is the only Eon that doesn ...

While Earth's slowdown is not noticeable on human timescales, it's enough to work significant changes over eons. One of those ...

The Hadean Eon occurred 4.6 billion to 4 billion years ago ... Mesolithic and Neolithic? Earth: Facts about the Blue Planet Astrogeophysicists theorize that about 4.52 billion years ago the ...

The oldest rock in the United States has been discovered in Michigan, with zircons dating back 3.82 billion years.

(One AU, or astronomical unit, is the average Earth-sun distance — about 93 million miles, or 150 million kilometers.) So, over the course of the 4.6 billion years that the solar system has ...

Australia holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old ... that solidified from lava there eons ago. (See also: "Oldest Rocks on ...

melt and reprocess the rocks of the Earth’s crust. As a result, ancient rocks are very rare and there are probably none now remaining from the Hadean eon (4.5–4 billion years ago ...