One year on from the disappearance of Malaysia Airlines Flight MH370, an extraordinary amount of key data remains unknown — fueling conspiracy theories and heated online debate about one of aviation's biggest mysteries.

An information vacuum has nourished a cottage industry of experts and amateurs in cyberspace who continue to exhaustively pick the case apart in a bid to find out just what happened to the plane and its 239 passengers and crew.

The resulting theories range from the wild — alien abduction, MH370 and its doomed fleetmate MH17 were the same plane — to sober, science-based arguments that the plane is in the southern Indian Ocean, but not necessarily in the current search area.