Nobody knows how life began on Earth, but some tantalizing clues from an asteroid suggest it might not have started here.

Johnson reports the crater can be seen today only in a 35-mile wide dome that marks exactly where the asteroid impacted.

It is widely believed that Earth's atmosphere has been rich in oxygen for about 2.5 billion years due to a relatively rapid ...

The Archean Eon (4–2.5 million years ago) is the second of Earth’s four major geologic eons, a time when the planet was mostly covered by oceans extending far deeper than those found today.

(CN) — More than a billion years ago, tectonic activity on Earth may have stopped so completely that no new mountains could be formed on the planet for an entire eon — putting evolution of life on ...

The Precambrian eon is vast, almost unimaginably so ... The Precambrian encompasses 86 percent of the history of Earth. As its name implies, this includes all of geological time prior to the ...

IESA is designed for inquisitive minds craving to cast a brighter light upon Earth's many mysterious eon-spanning processes. The curriculum directs students to discover and explore new focus areas ...