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The first page of The Time Machine published by Heinemann. Time travel is the hypothetical activity of traveling into the past or future. Time travel is a widely recognized concept in philosophy and fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a hypothetical device known as a time machine.
A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future. While the notion of time travel to the future complies with the current understanding of physics via relativistic time dilation, temporal ...
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science. In this visualization, the Big Bang took place at the beginning of January 1 at midnight, and the ...
Physical cosmology. This timeline of cosmological theories and discoveries is a chronological record of the development of humanity's understanding of the cosmos over the last two-plus millennia. Modern cosmological ideas follow the development of the scientific discipline of physical cosmology.
Curiosity rover on Mars (5 August 2015). The Mars Science Laboratory and its rover, Curiosity, were launched from Earth on 26 November 2011. As of October 1, 2024, Curiosity has been on the planet Mars for 4321 sols (4439 total days; 12 years, 56 days) since landing on 6 August 2012.
1971: Place cells in the brain are discovered by John O'Keefe. 1974: Russell Alan Hulse and Joseph Hooton Taylor, Jr. discover indirect evidence for gravitational wave radiation in the Hulse–Taylor binary. 1977: Frederick Sanger sequences the first DNA genome of an organism using Sanger sequencing.
Entries beginning with "Timeline of " are ordered by the rest of their names. (For example: Timeline of geology is listed under " G ".) Further, timelines containing extra wording before the key concept are indexed under the key concept. (For example: Timeline of discovery of Solar System planets and their moons is listed under " S ".)
to the end of the template code, making sure it starts on the same line as the code's last character. This is a category of templates that generate timelines. A few of them are a specific timeline used in one article context. Others are parameterizable templates, used to generate a particular type of timeline visualization, in multiple contexts.