5000000000

5,000,000,000 is also known as 5.5/Apple/26.

Major Events
The sun expanded and the Earth was finally destroyed. The sun had been prevented from expanding by the National Trust however when the money ran out, nature was left to take its course. The destruction of the Earth was witnessed by some of the richest figures in many galaxies who assembled on Platform One for the historic event. (DW: The End of the World)

Following the destruction of the Earth a revival movement arose among the Human populations of the known galaxies, who began to feel nostalgic for their lost home. When they found a planet which was the same size, same gravity, with the same atmosphere and similar orbit around its star in the Galaxy M87, they colonised it, naming it New Earth. (DW: New Earth)

In the course of this, some of Agatha Christie's books are published again, one of which (a reprint of Death in the Clouds from 1935) ends up in a chest in the TARDIS. The existence of the book also establishes that print media remains viable in this time, though whether as a going concern or any for "retro" value is unknown. (DW: The Unicorn and the Wasp).