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  2. Void (astronomy) - Wikipedia

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

    There exist a number of ways for finding voids with the results of large-scale surveys of the universe. Of the many different algorithms, virtually all fall into one of three general categories. [27] The first class consists of void finders that try to find empty regions of space based on local galaxy density. [28]

  3. Boötes Void - Wikipedia

    en.wikipedia.org/wiki/Boötes_Void

    A map of the Boötes Void. The Boötes Void (/ b oʊ ˈ oʊ t iː z / boh-OH-teez) (colloquially referred to as the Great Nothing) [1] is an approximately spherical region of space found in the vicinity of the constellation Boötes, containing only 60 galaxies instead of the 2,000 that should be expected from an area this large, hence its name.

  4. The Void (philosophy) - Wikipedia

    en.wikipedia.org/wiki/The_Void_(philosophy)

    Evangelista Torricelli's vacuum experiments in the 1640s demonstrated the possibility of an empty space devoid of matter, challenging the longstanding Aristotelian belief that nature abhors a vacuum (horror vacui). These experiments laid the groundwork for a new understanding of the Void as a physical reality rather than a mere conceptual ...

  5. Torricelli's experiment - Wikipedia

    en.wikipedia.org/wiki/Torricelli's_experiment

    He also stated that the changes of liquid level from day to day are caused by the variation of atmospheric pressure. The empty space in the tube is called the Torricellian vacuum. [3] 760 mmHg = 1 atm; 1 atm = 1 013 mbar or hPa; 1 mbar or hPa = 0.7502467 mmHg; 1 pascal = 1 Newton per square metre (SI unit) 1 hectopascal is 100 pascals

  6. Local Hole - Wikipedia

    en.wikipedia.org/wiki/Local_Hole

    The KBC Void (or Local Hole) is an immense, comparatively empty region of space, named after astronomers Ryan Keenan, Amy Barger, and Lennox Cowie, who studied it in 2013. [1] The existence of a local underdensity has been the subject of many pieces of literature and research articles. [2] [3] [4]

  7. Vacuum energy - Wikipedia

    en.wikipedia.org/wiki/Vacuum_energy

    Vacuum energy is an underlying background energy that exists in space throughout the entire universe. [1] The vacuum energy is a special case of zero-point energy that relates to the quantum vacuum .

  8. Zero-point energy - Wikipedia

    en.wikipedia.org/wiki/Zero-point_energy

    The idea that "empty" space can have an intrinsic energy associated with it, and that there is no such thing as a "true vacuum" is seemingly unintuitive. It is often argued that the entire universe is completely bathed in the zero-point radiation, and as such it can add only some constant amount to calculations.

  9. Empty space - Wikipedia

    en.wikipedia.org/wiki/Empty_space

    Outer space, especially the relatively empty regions of the universe outside the atmospheres of celestial bodies; Vacuum, a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure; Free space, a perfect vacuum as expressed in the classical physics model

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