How the world might end has been the subject of many Hollywood films.
It's also the area New Zealander Rob Bast has dedicated his life to studying.
He says the most likely possibility is a dark comet – one which has so far been missed by astronomers.
Number two on his list is a giant solar-storm, which would send the world into a power blackout for months.
Watch the video for Janika ter Ellen’s full report.