How Did The Earth Form?

An overview of fractionation, Mara's survival, 'Grand Tack' theory, formation of Mercury, solidifying Earth, and theories surrounding Theia.

What Was Earth Like 4 Billion Years Ago?

The Mystery of the Late Heavy Bombardment

Where Did Earth's Water Come From?

How Did Life Begin?

What Was The Last Common Ancestor of all Life on Earth?

Were Volcanoes The Key To Life?

Did Life on Earth Come From Space?

What Would The Earth Have Been Like Without Life?

What is the Oldest Fossil on Earth?

How The Earth Got Its Magnetic Field (And Why It Might Not Protect Us Much Longer)

What Was Earth Like 3 Billion Years Ago?

How Bad Was The Great Oxidation Event?

How Did Life Recover From The First Mass Extinction?

What Would The Earth Be Like Without Photosynthesis?

World Without Photosynthesis

What Was The First Virus?

Older Than Life? Evolution of Viruses

What Is The Other 99.99% Of Life?

4 Billion Years of Life: Tour of the Biosphere

What Was The Earth Like 2 Billion Years Ago?

2 Billion Years Ago: After The Great Flood

A Tour of Earth's Ancient Supercontinents

Before Pangaea

A Tour of Earth's Ancient Superoceans

Exploring Earth's Prehistoric All Sea

What Was The "Boring Billion" Really Like?

1.8 to 0.8 Billion Years Ago: Earth's Lost Billion Years

What Was The First Complex Life on Earth?

Earth's Impossible Fossils

What Was The Earth Like 1 Billion Years Ago?

One Billion Years Ago: Is This Eden?

What Was The First Fungus?

The Key to Life? Evolution of Fungi

Why Did The Earth Totally Freeze For 100 Million Years?

Snowball Earth

Were These The First Animals?

The Ediacaran: Life's Failed Experiment?

How Far Back In Time Could You Have Survived On Earth?

How Far Back In Time Could You Have Survived On Earth?