What If...? An alternative history of the world
What if the dinosaurs had survived? Or Hitler won in 1945? Or the aeroplane had been invented 1,000 years earlier? Would there even be life on earth if the moon had failed to form? Science fiction writer Stephen Baxter canvasses the possibilities.
4.5 billion years ago: The Moon never formed
65 million years ago: The dinosaur extinction does not happen
875: Flight discovered 1,000 years early
1348: The Black Death is averted
1441: Chinese explorers discover America
1945: Germany wins World War II
1962: The Cuban missile crisis blows up
1986: Nasa carries on to Mars