H.G. Wells introduced people to the idea of our earth narrowly missing a collision with another planet or was that a comet and one really cannot say what it was. Either the author did his best to conceal what the threat was exactly or because he was not a scientist, it did not matter. The point was this astronomical threat would threaten every earthly soul.
Somehow this unknown comet combined with Neptune to take it out of its orbit so that it would head towards the earth and onto its collision path with this sun. There was tumultuous seismic activity on its way to the earth, which ebbed on its way past this planet. According the short story there were innumerable amounts of dead along the way.
One wonders what would happen once his unknown combo of Neptune and this fireball would cause with the center of our solar system but according the story so many would actually not care in the least. If I can extend their attitude to today a very small amount of people would ever wonder of how the end of the world would ever affect them.