How Did The Earth Form?

E1

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?

E2

The Mystery of the Late Heavy Bombardment

E3

Where Did Earth's Water Come From?

E4

How Did Life Begin?

E5

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

E6

Were Volcanoes The Key To Life?

E7

Did Life on Earth Come From Space?

E8

What Would The Earth Have Been Like Without Life?

E9

What is the Oldest Fossil on Earth?

E10

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

E11

What Was Earth Like 3 Billion Years Ago?

E12

How Bad Was The Great Oxidation Event?

E13

How Did Life Recover From The First Mass Extinction?

E14

What Would The Earth Be Like Without Photosynthesis?

E15

World Without Photosynthesis

What Was The First Virus?

E16

Older Than Life? Evolution of Viruses

What Is The Other 99.99% Of Life?

E17

4 Billion Years of Life: Tour of the Biosphere

What Was The Earth Like 2 Billion Years Ago?

E18

2 Billion Years Ago: After The Great Flood

A Tour of Earth's Ancient Supercontinents

E19

Before Pangaea

A Tour of Earth's Ancient Superoceans

E20

Exploring Earth's Prehistoric All Sea

What Was The "Boring Billion" Really Like?

E21

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

What Was The First Complex Life on Earth?

E22

Earth's Impossible Fossils

What Was The Earth Like 1 Billion Years Ago?

E23

One Billion Years Ago: Is This Eden?

What Was The First Fungus?

E24

The Key to Life? Evolution of Fungi

Why Did The Earth Totally Freeze For 100 Million Years?

E25

Snowball Earth

Were These The First Animals?

E26

The Ediacaran: Life's Failed Experiment?

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

E27

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