About 12 billion years ago, scientists think, from a singular explosion, the universe was born. In those first moments, intensely hot hydrogen and helium raced outward – thinning, cooling, and clumping into vast, organized structures.
Within a few billion years, countless galaxies had emerged. Each one containing hundreds of billions of stars – constantly changing in cycles of birth, death and rebirth. In one of these galaxies, about 5 billions years ago, one average-sized star, our sun, captured in its gravitational field the gas and dust that would become 9 planets.