Apocalypse of 2045

Astronomers, from before the apocalypse and after, were puzzled, knowing that there was a 100-mile-wide meteorite, hurtling towards Earth; but Mike Knight, born in 2036, survived due to him drinking the Elixir of Life-Extension.

January thirteenth (it was a Friday), 2045 was when the meteorite struck. This wiped out the entire four underwater nations and the entire human race.

Astronomy of 2045
Astronomers, including the famous Tyler Daniels, have found that the meteorite was coming, but it was too late for him to strive to delay or stop the meteorite.

Astronomy: After the Apocalypse
Looking back, astronomers, including the 16-year-old intern Jack Knight, found that the metorite was more than a hundred miles wide. The meteorite, also, had come from another galaxy. It had also glided in the atmosphere (full of methane) of the planet Neptune.