How Did The Earth Form?

Episode number: 1

Overview: 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?

Episode number: 2

The Mystery of the Late Heavy Bombardment

Episode number: 3

Where Did Earth's Water Come From?

Episode number: 4

How Did Life Begin?

Episode number: 5

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

Episode number: 6

Were Volcanoes The Key To Life?

Episode number: 7

Did Life on Earth Come From Space?

Episode number: 8

What Would The Earth Have Been Like Without Life?

Episode number: 9

What is the Oldest Fossil on Earth?

Episode number: 10

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

Episode number: 11

What Was Earth Like 3 Billion Years Ago?

Episode number: 12

How Bad Was The Great Oxidation Event?

Episode number: 13

How Did Life Recover From The First Mass Extinction?

Episode number: 14

What Would The Earth Be Like Without Photosynthesis?

Episode number: 15

Overview: World Without Photosynthesis

What Was The First Virus?

Episode number: 16

Overview: Older Than Life? Evolution of Viruses

What Is The Other 99.99% Of Life?

Episode number: 17

Overview: 4 Billion Years of Life: Tour of the Biosphere

What Was The Earth Like 2 Billion Years Ago?

Episode number: 18

Overview: 2 Billion Years Ago: After The Great Flood

A Tour of Earth's Ancient Supercontinents

Episode number: 19

Overview: Before Pangaea

A Tour of Earth's Ancient Superoceans

Episode number: 20

Overview: Exploring Earth's Prehistoric All Sea

What Was The "Boring Billion" Really Like?

Episode number: 21

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

What Was The First Complex Life on Earth?

Episode number: 22

Overview: Earth's Impossible Fossils

What Was The Earth Like 1 Billion Years Ago?

Episode number: 23

Overview: One Billion Years Ago: Is This Eden?

What Was The First Fungus?

Episode number: 24

Overview: The Key to Life? Evolution of Fungi

Why Did The Earth Totally Freeze For 100 Million Years?

Episode number: 25

Overview: Snowball Earth

Were These The First Animals?

Episode number: 26

Overview: The Ediacaran: Life's Failed Experiment?

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

Episode number: 27

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