If a story involves future space travel, do you think you have to specify how far into the future we're talking? Does it matter if none of the story takes place on earth but does involve humans? I don't mention how far into the future my story takes place. I actually don't really know. It hasn't seemed like that's really a relevant part of the story. But is overlooking that creating a problem? I'm still new to writing science fiction. This story involves things that don't currently exist but could in some variation some day. Does it matter if it's 20 years or 100 years from now? And should it to the story? Would that ground things more? How do you guys handle this with your science fiction?