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  2. Pulsar timing array - Wikipedia

    en.wikipedia.org/wiki/Pulsar_timing_array

    The pulsar acts as the reference clock at one end of the arm sending out regular signals which are monitored by an observer on Earth. The effect of a passing long-wavelength GW would be to perturb the galactic spacetime and cause a small change in the observed time of arrival of the pulses. [6]: 207–209

  3. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events ...

  4. iPad Mini - Wikipedia

    en.wikipedia.org/wiki/IPad_Mini

    The iPad Mini (branded and marketed as iPad mini) is a line of small tablet computers developed and marketed by Apple Inc. It is a sub-series of the iPad line of tablets, with screen sizes of 7.9 inches and 8.3 inches. The first-generation iPad Mini was announced on October 23, 2012, and was released on November 2, 2012, in nearly all of Apple ...

  5. Multiple time dimensions - Wikipedia

    en.wikipedia.org/wiki/Multiple_time_dimensions

    Dunne suggested that, in the context of a "block" spacetime as modelled by General Relativity, a second dimension of time was needed in order to measure the speed of one's progress along one's own timeline. This in turn required a level of the conscious self existing at the second level of time.

  6. Four-velocity - Wikipedia

    en.wikipedia.org/wiki/Four-velocity

    The history of an object traces a curve in spacetime, called its world line. If the object has mass, so that its speed is necessarily less than the speed of light, the world line may be parametrized by the proper time of the object. The four-velocity is the rate of change of four-position with respect to the proper time along the curve. The ...

  7. Spacetime diagram - Wikipedia

    en.wikipedia.org/wiki/Spacetime_diagram

    A spacetime diagram is a graphical illustration of locations in space at various times, especially in the special theory of relativity.Spacetime diagrams can show the geometry underlying phenomena like time dilation and length contraction without mathematical equations.

  8. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    Foucault's pendulum in the Panthéon of Paris can measure time as well as demonstrate the rotation of Earth. In physics , time is defined by its measurement : time is what a clock reads. [ 1 ] In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol t {\displaystyle t} ) and, like length , mass , and charge ...

  9. iPad Mini (6th generation) - Wikipedia

    en.wikipedia.org/wiki/IPad_Mini_(6th_generation)

    The sixth-generation iPad Mini (stylized and marketed as iPad mini and colloquially referred to as iPad Mini 6) is a tablet computer in the iPad Mini line, developed and marketed by Apple Inc. It was announced on September 14, 2021, and released on September 24, 2021, alongside the ninth-generation iPad , iPhone 13 and iPhone 13 Pro .