How did life on earth appear? Science suggests that life started when the planet was favourable for habitation. Yet did microscopic organisms just pop out of nowhere? One hypothesis is panspermia, which suggests that ‘seeds of life’ exist everywhere around the universe, and that life on earth started when these ‘seeds’ came here, probably by a meteor. It also suggests that these seeds are taken to other habitable places in the universe. Something similar to this is exo-genesis. It suggests that life was brought to earth those billions of years ago, however it does not say that life is also taken to other habitable places. Some people believe aliens brought life to our planet, as suggested by the theories of Erich Von Daniken. Although some are sceptical as to how life could exist in space and get carried to other planets, there is substantial evidence that certain life forms, like spores and certain types of bacteria can actually exist in space, perhaps in a dormant state.