Illustration of the formation of Earth overlaid with Polaroid of same image
Illustration of the formation of Earth overlaid with Polaroid of same image

Planet Earth’s Polaroids: History’s Family Photo Album

Planet Earth’s Polaroids: History’s Family Photo Album

If planet Earth were a person, it would have a lot of stories to tell (not to mention a next-level Instagram feed and the wisdom of about a hundred thousand grandparents). Birth, death, ice ages, empires, microbes and mammals and Pokémon™ Go. From the moment it burst into existence as a molten ball of magma, Earth has pretty much been a no-dull-moment place.

We’ve imagined what it would be like to flip through planet Earth’s photo album and take a look at a few of its particularly important milestones. They’re the moments your Mom would make you dress up for, and they’re the memories that will last a lifetime (or two, or seven billion).

So on your marks, get set, say “CHEESE!”

1. The day Earth was born | Formation of a planet

Polaroid showing graphic of formation of Earth

Far from an adorable newborn, early Earth was a terrifying, chaotic, molten thing. Much like a newborn, however, it came into existence screaming and crying (so to speak).

Around 4.5 billion years ago, rock and ice orbiting the early Sun collided into a small, rocky planet under the force of gravity, and our infant planet continued to be battered by many objects, some the size of planets. The energy of these collisions kept early Earth incredibly hot and much of its material remained molten. Heavier elements sank to the bottom of the magma ocean and lighter material bobbed to the surface. Eventually layers started to form as this process continued. The surface cooled and solidified into a crust as the number of impacts from space fell, and the planet gradually settled into the layers we’re familiar with today.

Not an easy birth, then.

2. The Earth’s first friend | The role of the Sun

Polaroid showing graphic of the Sun

Everyone needs a good friend they can rely to provide love, support, laughs, and solar radiation to use in energy-producing chemical processes. Right?

Between 4.1 and 3.8 billion years ago, planets shifted their orbits in a cascade of gravitational disruption, and the process left eight major planets in orbit around the Sun. This included Earth, which is held by Sun’s loving gravity to this day. Our planet continues to count on this enormous star for light, warmth and live-giving energy.

3. Earth’s new outfit | Continental drift

Polaroid showing graphic of Earth

Since Earth’s layers stabilized four billion years ago, its tectonic plates have been constantly moving, gradually changing the appearance of our planet. The map of our modern world is a familiar image, but the current arrangement of continents is a relatively recent development in our planet’s history. Think of it like a series of outfit changes – except instead of hats and shoes, the collision of tectonic plates can cause entire mountain ranges to form. The Himalayas, for example, were created when the Indian plate slammed into the Eurasian plate around 50 million years ago. How’s that for a new accessory?

4. Earth’s first party | The explosion of animal life

Polaroid graphic of panderichthys, Devonian vertebrate

About six hundred million years ago there was a party on Earth and everyone was invited. It was all the regular VIPs: anthropods, sponges, the usual. The occasion was the first big explosion of animal life, in oceans already alive with algae and microbes. From modest beginnings as creepers and grazers on the sea bed, animals quickly evolved into all the main groups alive today.

By the time of the Cambrian Explosion, all major kinds of living animals – flatworms, molluscs, and anthropods included – had evolved. But other, less familiar types evolved alongside them, and some fossils suggest the existence of animals very unlike anything alive today. Many of these ancient types disappeared without leaving lasting descendants, but others went on to fill the planet with animal life (they kept the party going, pretty much). 

5. Earth learns to read | The development of the written word

Polaroid graphic of cuneiform writing on clay slab

It was around 3300 BCE that Earth learned its ABCs. Writing began in ancient Egypt and Mesopotamia as a way to store vital information. Pictographs could stand for words, ideas and sounds, and were used to keep things like economic records. 

Earth made its first papyrus around 3000 BCE in Egypt, printed on paper in China in the 1st century CE, and invented the moveable-type printing press in the 15th century (with the help of a clever guy named Johannes Gutenberg).

6. Earth’s new job | The advent of agriculture

Polaroid showing photo of corn crops

Earth has a pretty varied CV, but from around 9600 BCE, it added something new to its list of skills – farming.

As global temperatures rose rapidly, humans were forced to find new ways to hunt and gather, and foragers across the world discovered new ways to boost their food supplies, most dramatically by farming. Instead of continually moving to find food, they could now settle permanently in one place.

The first farmers worked the land with wooden digging sticks and stone-bladed hoes and adzes, and could grow just enough crops to feed their families. Talk about upskilling!

7. Earth’s career change | The Industrial Revolution

Polaroid showing illustration of steam trains

In the mid-18th century, Earth decided it was a time for a change, and a big one. After hundreds of years of slow development, a series of innovations in Britain began a process that would change the world forever. This process is now known as the Industrial Revolution.

The Industrial Revolution transformed agrarian societies that discovered how to use fossil fuels like coal to replace human and animal power in manufacturing, communication and transportation. It began in Britain, when several factors – both global and local – ushered in an era of relatively fast technological change. This period can be characterised by new production methods, more efficient transportation networks, and the rapid growth of cities. Shiny new career change complete.

8. Earth expands its family | Population explosion

Polaroid showing photo of crowded beach

Over the last 250 years, Earth decided it was high time to upsize its family. In 1800, there were 900 million people in the world; by 1900 there were 1.6 billion; by 2000 there were 6.1 billion; and today the world population has reached over 7 billion.

That’s a lot of mouths to feed and a lot of bodies to clothe, though! As a species, we’re using 24 times as many resources as we used 100 years ago. If we’re going to take the strain off of Earth, we’ll need to start helping out around the house by finding sustainable solutions and taking better care of our only home.


From the formation of our universe to the present day, countless major events have changed the course of life on Earth. Big History brings together an incredible range of perspectives, using multiple disciplines including physics and sociology to bring us the story of 13.8 billion years of remarkable history. With a foreword by TED speaker Professor David Christian, Big History is a truly unique look at the history of the world.

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