DVK's recent question got me thinking about something I thought when I first saw "The fifth Element".
From the setting it is obvious that there are multiple alien species, which means that there are many planets capable of creating life, and even more capable of sustaining it (as in the Fhloston Paradise).
Yet it seems that only Earth is the target of the "evil spirit/living world" that appears every so many thousands of years.
Is that explained somehow through the movie? Or outside it?