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  2. Action at a distance - Wikipedia

    en.wikipedia.org/wiki/Action_at_a_distance

    Action at a distance is the concept in physics that an object's motion can be affected by another object without the two being in physical contact; that is, it is the concept of the non-local interaction of objects that are separated in space.

  3. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    In physics, the twin paradox is a ... a distance d = 4 light years away, ... and during the 3 years of the trip back it increases up to "10 years after launch", so ...

  4. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    The Andromeda Galaxy is approximately 2.5 million light-years away. 3 × 10 6 ly: The Triangulum Galaxy , at about 3 million light-years away, is the most distant object visible to the naked eye. 5.9 × 10 7 ly: The nearest large galaxy cluster, the Virgo Cluster, is about 59 million light-years away. 1.5 × 10 8 – 2.5 × 10 8 ly

  5. Wheeler–Feynman absorber theory - Wikipedia

    en.wikipedia.org/wiki/Wheeler–Feynman_absorber...

    Unlike instantaneous action at a distance theories of the early 1800s these "direct interaction" theories are based on interaction propagation at the speed of light. They differ from the classical field theory in three ways 1) no independent field is postulated; 2) the point charges do not act upon themselves; 3) the equations are time symmetric.

  6. Hubble's law - Wikipedia

    en.wikipedia.org/wiki/Hubble's_law

    The Hubble length or Hubble distance is a unit of distance in cosmology, defined as cH −1 — the speed of light multiplied by the Hubble time. It is equivalent to 4,420 million parsecs or 14.4 billion light years. (The numerical value of the Hubble length in light years is, by definition, equal to that of the Hubble time in years.)

  7. Faster-than-light - Wikipedia

    en.wikipedia.org/wiki/Faster-than-light

    The current distance to this cosmological event horizon is about 16 billion light-years, meaning that a signal from an event happening at present would eventually be able to reach us in the future if the event was less than 16 billion light-years away, but the signal would never reach us if the event was more than 16 billion light-years away. [19]

  8. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    In particle physics and physical ... 4.35 × 10 17 s or 1.38 × 10 10 years Diameter: 5.4 × 10 61 l P: ... The Planck length is a distance scale of interest in ...

  9. Absolute magnitude - Wikipedia

    en.wikipedia.org/wiki/Absolute_magnitude

    An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly 10 parsecs (32.6 light-years), without extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust. By hypothetically placing all objects at a standard ...