I. Catalog a... ABSTRACT We present a catalog of 38 young solar analogs within 25 pc, stars that are uniquely well suited for observations of their circumstellar environments to improve our ...

The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 million years ago) is known as the age of bacteria and archaea. The Proterozoic ...

During the earliest stage of Earth's existence, the Hadean eon, the planet was simply ... While life wouldn't emerge until ...