“Time travel is a colloquial term for journeying into the past or the future. There are several...Time travel
“Alternate realities, or parallel universes, are a concept that stems from Hugh Everett's...Alternate reality
“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.