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seen Jun 11 '13 at 20:22

Sep
13
comment Potential confusion: referring to home planet as “Earth”
For your last point though, there are cases where leaving the reader confused are reasonable. For example, with narration tied to a character and that character becomes confused in a conversation, it is perfectly acceptable to leave the reader no more confident of the correct interpretation. The key is don’t leave the reader confused unless you have made it clear to the reader that they should be mildly confused (the confusion usually gets cleared up later).