Final answer:
The piece of evidence that is not related to the future is Mention of historical events.
Step-by-step explanation:
Based on the given options, the piece of evidence that is not related to the future is B) Mention of historical events. The other options, such as advanced technology, futuristic architecture, and references to space exploration, all suggest a setting in the future. Advanced technology implies that there have been advancements beyond our current capabilities, futuristic architecture indicates a different architectural style in the future, and references to space exploration suggest that space travel is possible, which is often associated with a future setting.