Oops, the Universe is Full
This is a short fiction story.
On April 11, 1951 AD, coincidentally after the Stone of Scone resurfaced in Arbroath Abbey in Scotland, the universe came unto its final shape: a plane of existence exactly 15.6 quintilons in circumference, apart from a little piece of it that stuck out like a triangle at 6 o’clock.
Unbeknownst to everything, this would have disastrous consequences, because on April 11, 15,871,783,242 CE, the species of the universe ran out of room.
There were too many people and not enough space for them all. The planets were stuff full and the imposing, coldly colossal megastructures floating in the space between planets were packed like sardines (which had gone extinct four million years ago and the genome misplaced).
Nearly every square inch of space was being taken up; the only place people could see space anymore was at the space parks like Dazzling Park and Leftward Park.
What were they to do? No more could be built, and there were no alternate universes to inhabit, and they had already reached the maximum number of pocket dimensions that could exist at any one time. (Food was no issue, mercifully.) And there was still 50 trillion years left before the universe ended!
The only sensible solution was to have a death lottery. Everyone between the ages of 60 to 90 was eligible to die. Of the 98 trillion names drawn, picked at random at 6 am on a Sunday, all 98 trillion of them died at midnight as peacefully as the violence of suicide can allow.
As the predictions accurately modeled with a 12% margin of error, the lottery worked. Nobody rioted and no elderly terrorists damaged or destroyed any infrastructure.
On April 11, 19,211,995,455 EF, also known as Lottery Day, 109 trillion people aged 60 to 90 died.