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  2. Sound energy - Wikipedia

    en.wikipedia.org/wiki/Sound_energy

    Sound waves that have frequencies below 16 Hz are called infrasonic and those above 20 kHz are called ultrasonic. Sound is a mechanical wave and as such consists physically in oscillatory elastic compression and in oscillatory displacement of a fluid .

  3. Void (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Void_(astronomy)

    Although dark energy is currently the most popular explanation for the acceleration in the expansion of the universe, another theory elaborates on the possibility of our galaxy being part of a very large, not-so-underdense, cosmic void. According to this theory, such an environment could naively lead to the demand for dark energy to solve the ...

  4. Baryon acoustic oscillations - Wikipedia

    en.wikipedia.org/wiki/Baryon_acoustic_oscillations

    This particular configuration of matter occurred at each anisotropy in the early universe, and therefore the universe is not composed of one sound ripple, [10] but many overlapping ripples. [11] As an analogy, imagine dropping many pebbles into a pond and watching the resulting wave patterns in the water. [ 2 ]

  5. Stephen Hawking's Universe - Wikipedia

    en.wikipedia.org/wiki/Stephen_Hawking's_Universe

    An Answer to Everything; An extensive online companion site was produced to accompany the documentary. The online companion covers history of cosmology, unanswered questions and other topics related to the program. It was designed to function as both a supplement to the series and a stand-alone web piece.

  6. Johannes Kepler - Wikipedia

    en.wikipedia.org/wiki/Johannes_Kepler

    Kepler completed the first of three volumes, consisting of Books I–III, by 1615 in the same question-answer format of Maestlin's and have it printed in 1617. [79] However, the banning of Copernican books by the Catholic Church, as well as the start of the Thirty Years' War , meant that publication of the next two volumes would be delayed.

  7. Cosmic microwave background - Wikipedia

    en.wikipedia.org/wiki/Cosmic_microwave_background

    Most of the radiation energy in the universe is in the cosmic microwave background, [58] making up a fraction of roughly 6 × 10 −5 of the total density of the universe. [ 59 ] Two of the greatest successes of the Big Bang theory are its prediction of the almost perfect black body spectrum and its detailed prediction of the anisotropies in ...

  8. Into the Universe with Stephen Hawking - Wikipedia

    en.wikipedia.org/wiki/Into_the_Universe_with...

    Into the Universe with Stephen Hawking is a 2010 science documentary television mini-series written by British physicist Stephen Hawking. The series was created for Discovery Channel by Darlow Smithson Productions and features computer generated imagery of the universe created by Red Vision .

  9. Special relativity - Wikipedia

    en.wikipedia.org/wiki/Special_relativity

    As such, the Newtonian mass of an object, which is the ratio of the momentum to the velocity for slow velocities, is equal to E/c 2. The energy and momentum are properties of matter and radiation, and it is impossible to deduce that they form a four-vector just from the two basic postulates of special relativity by themselves, because these do ...

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