13,000,000,000 BBY

The following events took place in 13,000,000,000 BBY.

Events
By the year 13,000,000,000 BBY, the Big Bang had already taken place, creating the universe. Many believed that it was in that year that a cloud of dust and gas one-hundred-thousand light years across within the universe experienced a gravitic collapse and populated itself with approximately four-hundred-billion stars, becoming the galaxy. Many of these stars developed orbiting planets over the ensuing eons. Half of these star systems maintained conditions favorable to life, ten percent of this half actually developed life, and only one in a thousand of the life-bearing worlds went on to bear true sentience.

Behind the scenes
The Essential Atlas (2009) by Jason Fry and Daniel Wallace later clarified the year 13,000,000,000 BBY as the approximate birth of the galaxy. Before that release, 5,000,000,000 BBY was the approximate date, as presented in The Essential Guide to Alien Species (2001) by Ann Margaret Lewis. This timeline alteration rectified a potential inconsistency. Before Lewis's Essential Guide was released, Goroth: Slave of the Empire established 5,000,000,000 BBY as the year around which life first emerged on Goroth Prime&mdash;a planet which would have taken quite a long time to form, let alone develop life. In-universe, this could simply be attributed to the error incurred naturally when dealing with such early dates.