“Alternate realities, or parallel universes, are a concept that stems from Hugh Everett's...Alternate reality
“Time travel is a colloquial term for journeying into the past or the future. There are several...Time travel
“Alternate timelines are an alteration or change in the current timeline, causing an alternate...Alternate timeline
This category has the following 6 subcategories, out of 6 total.
Pages in category "Science"
The following 75 pages are in this category, out of 75 total.