This is the story of a small planet in space called Earth.
Today it has mighty oceans; scorched deserts; and frozen wildernesses.
It supports a multitude of diverse creatures, and is home to more than 6 billion people and their technological civilization.
But how did all this come about? Where do we come from?
Until recently, Earth and its lifeforms were a mystery. Like a huge unpainted canvas, little was known about the origin of Earth and its inhabitants.
But today, we have a rough idea of what happened.
It began – with a bang