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

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 ...

Eons is available to stream on pbs.org and the ... Without plate tectonics, the Earth would look very different than it does today. Our mountain ranges, oceans, volcanoes, and even entire ...

(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 ...

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 ...

So, how do we go about this? If we consider Earth’s age as 4.54 billion years and divide it by 365 days, each day of the Gregorian calendar represents about 12.438 million years. Let’s say we ...

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 ...

And while we actually do know how it originated—about 2.4 billion years ... of the next few eons are a little less clear. After that, the level of oxygen in Earth’s atmosphere went wildly ...

This iron will become important later. The Archean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from ...