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  2. Orders of magnitude (speed) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(speed)

    Speed of propagation for unmyelinated sensory neurons. 30: 110: 70: 1 × 10 −7: Typical speed of car (freeway); cheetah—fastest of all terrestrial animals; sailfish—fastest fish; speed of go-fast boat. 40: 140: 90: 1.3 × 10 −7: Typical peak speed of a local service train (or intercity on lower standard tracks). 40.05: 144.17: 89.59: 1. ...

  3. Accelerating expansion of the universe - Wikipedia

    en.wikipedia.org/wiki/Accelerating_expansion_of...

    Thus, an accelerating universe took a longer time to expand from 2/3 to 1 times its present size, compared to a non-accelerating universe with constant ˙ and the same present-day value of the Hubble constant. This results in a larger light-travel time, larger distance and fainter supernovae, which corresponds to the actual observations.

  4. Oh-My-God particle - Wikipedia

    en.wikipedia.org/wiki/Oh-My-God_particle

    A proton with that much energy would travel 1.665 × 10 15 times closer to the speed of light than the Oh-My-God particle did. As viewed from Earth and observed in Earth's reference frame, it would take about 3.579 × 10 20 years (2.59 × 10 10 times the current age of the universe) for a photon to overtake a Planck energy proton with a 1 cm lead.

  5. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    One example is represented by the conditions in the first 10 −43 seconds of our universe after the Big Bang, approximately 13.8 billion years ago. The four universal constants that, by definition, have a numeric value 1 when expressed in these units are: c, the speed of light in vacuum, G, the gravitational constant, ħ, the reduced Planck ...

  6. Measurements of neutrino speed - Wikipedia

    en.wikipedia.org/wiki/Measurements_of_neutrino_speed

    Since the protons are transferred in bunches of one nanosecond duration at an interval of 18.73 ns, the speed of muons and neutrinos could be determined. A speed difference would lead to an elongation of the neutrino bunches and to a displacement of the whole neutrino time spectrum. At first, the speeds of muons and neutrinos were compared. [5]

  7. Faster-than-light - Wikipedia

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

    The value obtained by dividing the distance traveled, as determined in the Earth's frame, by the time taken, measured by the traveller's clock, is known as a proper speed or a proper velocity. There is no limit on the value of a proper speed as a proper speed does not represent a speed measured in a single inertial frame.

  8. Physicists create a 'quantum ruler' to measure the universe - AOL

    www.aol.com/news/2016-06-23-physicists-create...

    A group of physicists from the Russian Quantum Center and the Moscow Institute of Physics and Technology have come up with a new method of creating a special entangled quantum state, one that ...

  9. Speed of gravity - Wikipedia

    en.wikipedia.org/wiki/Speed_of_gravity

    The orbits of these binary pulsars are decaying due to loss of energy in the form of gravitational radiation. The rate of this energy loss ("gravitational damping") can be measured, and since it depends on the speed of gravity, comparing the measured values to theory shows that the speed of gravity is equal to the speed of light to within 1%. [22]

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