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The 1966-67 TV series The Time Tunnel.. In the 1967 Star Trek episode "The City on the Edge of Forever", a temporarily deranged Dr. Leonard McCoy runs into a time portal, an ancient sentient stone-like ring which calls itself the Guardian of Forever, and is transported back to 1930s Depression-era Earth and history is changed as shown when the Enterprise disappears from orbit.
The notion of time travel from the future to the past is thought to have been introduced for the first time in literature by French botanist and geologist Pierre Boitard in his popular 1861 book Paris avant les hommes (Paris before Men), featuring a man sent back to prehistoric Earth where he interacts with an ape-like ancestor, [7] A few years ...
Earth's magnetosphere and the Sun's magnetic field are constantly pressed against one another on the dayside of Earth. Approximately every eight minutes, these fields briefly merge, forming a temporary "portal" between the Earth and the Sun through which high-energy particles such as solar wind can flow. The portal takes the shape of a magnetic ...
One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; [36]: 503 it is more of a path through time rather than it is a device that itself moves through time, and it would not allow the technology itself to be moved backward in time. [50] [51]
The special revolved around the Doctor’s (Ncuti Gatwa) arrival at the Time Hotel, which as the name suggests, offers “all of human history as mini-breaks” with each room acting as a time portal.
Time travellers from the late twenty-first to the early twenty-second century go through a one-way time portal to the Earth's Pliocene. The world is controlled by humanoid extraterrestrials. 1982 Life, the Universe and Everything: Douglas Adams: Time travel paradoxes form the basis of this broad comedy, as in the case of the ancient poet ...
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History portal; Art of Europe; Geologic time scale; List of fossil sites with link directory. List of timelines around the world. Logarithmic timeline shows all history on one page in ten lines. Orders of magnitude (time) Periodization for a discussion of the tendency to try to fit history into non-overlapping periods. Time. Planck Time