3steps from the big bang
125things can go into it
city
SystemPlace
About 45% of people live in cities, up from 20% in 1950, and many more live in towns.
First appearedc. 4,000 BCE
Made Of
Everything is made of something.← What it takes
What it leads to →
Nothing on this map is built from it yet.
About 45% of people live in cities, up from 20% in 1950, and many more live in towns.
From the big bang to city
The most direct chain from the start of the universe, following what things are made from and, for living things, what they evolved from. Each step shows when it first appeared.
big bang13.8 bn yrs ago
Hhydrogen13.8 bn yrs ago
water4.4 bn yrs ago
cityc. 4,000 BCE