Conditions on Earth during its first 500 million years may have been cool enough to form oceans of water instead of being too hot for life to form. This alternate view of Earth's first geologic eon, ...

Intro -- Preface -- References -- Contents -- 1 Why Hadean? -- Abstract -- 1.1 Introduction -- 1.2 Organization of This Book -- 1.2.1 A Brief Overview -- 1.2.2 Chapter Themes -- 1.3 Defining the ...

Earth should have lost its water long before life ever had a chance to appear. Bathed in a young Sun’s fierce radiation and ...

The Hadean and Eoarchean epochs were the real hell on Earth. For millions of years, our planet was heavily bombarded by millions of asteroids with “existing oceans repeatedly boiled away into steam ...

New research shows that more than four billion years ago, the surface of Earth was heavily reprocessed as a result of giant asteroid impacts. A new model based on existing lunar and terrestrial data ...

The general consensus up until the late 20th century was that after Earth’s formation 4.54 billion years ago, the planet was a hellish place covered in magma. But now scientists say conditions on ...

Humanity’s trips to the moon revolutionized our view of this planet. As seen from another celestial body, Earth seemed more fragile and more precious; the iconic Apollo 8 image of Earth rising above ...

Earth formed about 4.6 billion years ago, during the geological eon known as the Hadean. The name "Hadean" comes from the Greek god of the underworld, reflecting the extreme heat that likely ...

Asteroids and comets repeatedly smashed into the early Earth and covered the planet's surface with molten rock during its earliest days, researchers have revealed. However, they say there may have ...

Conditions on Earth for the first 500 million years after it formed may have been surprisingly similar to the present day, complete with oceans, continents and active crustal plates. This alternate ...