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Circumstellar Disks

Planetesimals

Terrestrial Planets of the Inner
Solar System

Gas Giant Planets
of the
Outer Solar System

Solar Nebula Disperses

Asteroids

Comets

Planetary Layers

Giant Impact

The Moon Forms

Lunar Magma Ocean

Earth's Initial Crust

Volcanism on Earth

Oldest Moon Rocks

Lunar Crust

Earth's Early
Atmosphere and Oceans

Earth Adds Land

Oceans on Mars?

Earth's Earliest Continental Rocks

Earth's Oldest Sedimentary Rocks

Origin of Life?

Planetary Impacts

Early Life

Mercury Cools

Lunar Volcanism

Oldest Fossils

Valles Marineris, Mars

Moon Becomes
Geologically Inactive

Outflow Channels
on Mars

A New Type of Cell

Making Oxygen

Oxygen Increases in the Atmosphere

Vredefort Impact Crater

The Oldest Rocks in
the Grand Canyon

Meteorites from Mars

Olympus Mons, Mars

Longer Days, More Distant Moon

Copernicus Crater

Earth Goes Into A Deep Freeze

Multicellular Marine Life

Barren Land

Cambrian Explosion of Life

Window to the Cambrian

First Fish

Lava Flows on Venus

Plants and Insects

Ocean Life Diversifies

Age of Fishes

Amphibians

Seed Plants

Reptiles

Permian Mass Extinction

First Dinosaurs

First Mammals

Rings of Saturn

First Bird

Reptiles Diversify

Prehistoric Turtles

First Flowering Plants

Tycho Crater

Giant Impact!

Age of Mammals

Human Ancestors

One Small Step . . . One Giant Leap