We've often received emails from people complaining about the mockery and abuse they receive from family, friends and co-workers when discussing this topic. br br Our view is that this topic should never be introduced to others, until they demonstrate a genuine interest. br br Nonetheless, those with a genuine interest in the topic will feel a natural urge to share their concerns about a possible threat to themselves and those close to them. Consequently, the most common questions they ask are, "where is Planet X and what is the most likely worst case scenario?" br br In the first program of this series, these two questions are taken head on, with direct answers.