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  2. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation was used in the Doctor Who episodes "World Enough and Time" and "The Doctor Falls", which take place on a spaceship in the vicinity of a black hole. Due to the immense gravitational pull of the black hole and the ship's length (400 miles), time moves faster at one end than the other.

  3. Gravitational time dilation - Wikipedia

    en.wikipedia.org/wiki/Gravitational_time_dilation

    Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events, as measured by observers situated at varying distances from a gravitating mass. The lower the gravitational potential (the closer the clock is to the source of gravitation), the slower time passes, speeding up as the gravitational ...

  4. Lists of Cosmos episodes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_Cosmos_episodes

    The following are lists of episodes from the Cosmos series: List of Cosmos: A Personal Voyage episodes , which first aired in 1980. List of Cosmos: A Spacetime Odyssey episodes , which first aired in 2014.

  5. Cosmos: A Spacetime Odyssey - Wikipedia

    en.wikipedia.org/wiki/Cosmos:_A_Spacetime_Odyssey

    Cosmos: A Spacetime Odyssey is a 2014 American science documentary television series. [2] The show is a follow-up to the 1980 television series Cosmos: A Personal Voyage, which was presented by Carl Sagan on the Public Broadcasting Service and is considered a milestone for scientific documentaries.

  6. Expansion of the universe - Wikipedia

    en.wikipedia.org/wiki/Expansion_of_the_universe

    Here 'space' is a mathematical concept that stands for the three-dimensional manifold into which our respective positions are embedded, while 'universe' refers to everything that exists, including the matter and energy in space, the extra dimensions that may be wrapped up in various strings, and the time through which various events take place ...

  7. Gravitational redshift - Wikipedia

    en.wikipedia.org/wiki/Gravitational_redshift

    At the time he only considered the time-dilating manifestation of gravity, which is the dominating contribution at non-relativistic speeds; however relativistic objects travel through space a comparable amount as they do though time, so purely spatial curvature becomes just as important.

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  9. Gravitational singularity - Wikipedia

    en.wikipedia.org/wiki/Gravitational_singularity

    The classical version of the Big Bang cosmological model of the universe contains a causal singularity at the start of time (t=0), where all time-like geodesics have no extensions into the past. Extrapolating backward to this hypothetical time 0 results in a universe with all spatial dimensions of size zero, infinite density, infinite ...