The Big Bang was the event that created the universe, an indeterminate amount of time prior to the formation of the galaxy. The galaxy's formation predates the formation of the Cularin system and the Yavin system, which would place the formation of the galaxy, and thus the Big Bang, some time prior to 7.5 billion years before the Battle of Yavin.
The Shawken Device was designed to cause a chain reaction that would destroy all star systems in the existing universe, with the purpose of eventually triggering a new Big Bang to begin the universe again. While this exact outcome is questionable, the effects produced by this superweapon could have still been disastrous had it ever been given a chance to destroy the planet Shawken, where it was located.
Behind the scenes
It is probable that the timespan between the Big Bang and the formation of the Star Wars galaxy was less than one billion years, as our own Milky Way galaxy is nearly as old as the universe itself.
The age of our universe, according to current scientific consensus, is approximately 13.7 billion years. Many fan-made timelines, such as Star Wars Timeline Gold, use references to Earth in Star Wars canon to determine the time difference between the events in the films and the present day. Timelines which assume only a few centuries or millennia often list 13,700,000,000 BBY as the date of the Big Bang.
However, since neither Earth nor the Milky Way galaxy is mentioned in canonical Star Wars materials, such calculations are purely speculative.
Sorry for the Confusion
It is obvious that this information is not accurate, in order for everything to be accurate, you would have to be talking about a massive spiral galaxy being stuffed into the tiny realm of quantum mechanics where nothing makes any sense at all and all known laws of physics aren't there but aren't not there at the same time. The odds of anything like star wars or just anything even remotely similar to anything on a larger scale happening are incalculably tremendous. Even then with odds like that, an interuniversal law of physics states that you can not go back in time no matter what. We need theoretical physicists and science fiction writers to come together and start all over with this article. Facts: The universe is currently approximately 13.75 billion years old, the first star (according to the time line on wookiepedia) was formed in 7.5 billion BBY, If the big bang was in 1,000,000,000 BBY, then galaxies formed over six billion years before the universe (impossible, matter didn't exist until a few seconds AFTER the big bang).
- Star Wars 87: Still Active After All These Years (Mentioned only) (First identified as Big Bang)
Notes and references
- Big Bang on Wikipedia