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  2. Space (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Space_(mathematics)

    Here, the motivating example is the C*-algebra (), where X is a locally compact Hausdorff topological space. By definition, this is the algebra of continuous complex-valued functions on X that vanish at infinity (which loosely means that the farther you go from a chosen point, the closer the function gets to zero) with the operations of ...

  3. Glossary of astronomy - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_astronomy

    For objects in the Solar System, the orbital period is often referred to as the sidereal period. orbital plane The imaginary geometric plane defined by the orbit of an astronomical body around its primary. The Earth's orbital plane, which defines the ecliptic, is commonly used as a plane of reference for the orbits of other objects in the Solar ...

  4. NASA's Space Place - Wikipedia

    en.wikipedia.org/wiki/NASA's_Space_Place

    The Space Place program produces a monthly kids column about space that is run in many newspapers nationwide and contributes a monthly newsletter column to numerous astronomy clubs. The program also distributes educational materials to museum partners across the United States. [11] These museums feature the materials in public displays.

  5. Space - Wikipedia

    en.wikipedia.org/wiki/Space

    Debates concerning the nature, essence and the mode of existence of space date back to antiquity; namely, to treatises like the Timaeus of Plato, or Socrates in his reflections on what the Greeks called khôra (i.e. "space"), or in the Physics of Aristotle (Book IV, Delta) in the definition of topos (i.e. place), or in the later "geometrical conception of place" as "space qua extension" in the ...

  6. Lists of astronomical objects - Wikipedia

    en.wikipedia.org/wiki/Lists_of_astronomical_objects

    List of Solar System objects; List of gravitationally rounded objects of the Solar System; List of Solar System objects most distant from the Sun; List of Solar System objects by size; Lists of geological features of the Solar System; List of natural satellites (moons) Lists of small Solar System bodies; Lists of comets; List of meteor showers ...

  7. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    Deep space is defined by the United States government as all of outer space which lies further from Earth than a typical low-Earth-orbit, thus assigning the Moon to deep-space. [118] Other definitions vary the starting point of deep-space from, "That which lies beyond the orbit of the moon," to "That which lies beyond the farthest reaches of ...

  8. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    [3] [4] [5] Based on strict dictionary definitions, "astronomy" refers to "the study of objects and matter outside the Earth's atmosphere and of their physical and chemical properties", [6] while "astrophysics" refers to the branch of astronomy dealing with "the behavior, physical properties, and dynamic processes of celestial objects and ...

  9. Two-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Two-dimensional_space

    A two-dimensional space is a mathematical space with two dimensions, meaning points have two degrees of freedom: their locations can be locally described with two coordinates or they can move in two independent directions. Common two-dimensional spaces are often called planes, or, more generally, surfaces. These include analogs to physical ...

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