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  2. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [1] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared ...

  3. Star - Wikipedia

    en.wikipedia.org/wiki/Star

    A star-forming region in the Large Magellanic Cloud. A star is a luminous spheroid of plasma held together by self-gravity. [1] The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light.

  4. Parabola - Wikipedia

    en.wikipedia.org/wiki/Parabola

    The point F is the foot of the perpendicular from the point V to the plane of the parabola. By symmetry, F is on the axis of symmetry of the parabola. Angle VPF is complementary to θ, and angle PVF is complementary to angle VPF, therefore angle PVF is θ. Since the length of PV is r, the distance of F from the vertex of the parabola is r sin ...

  5. Zenith - Wikipedia

    en.wikipedia.org/wiki/Zenith

    Zenith. The zenith ( UK: / ˈzɛnɪθ /, US: / ˈziːnɪθ /) [1] is an imaginary point directly "above" a particular location, on the celestial sphere. "Above" means in the vertical direction ( plumb line) opposite to the gravity direction at that location ( nadir ). The zenith is the "highest" point on the celestial sphere.

  6. Science - Wikipedia

    en.wikipedia.org/wiki/Science

    Science is a strict systematic discipline that builds and organizes knowledge in the form of testable hypotheses and predictions about the world. [1] [2] Modern science is typically divided into three major branches: [3] the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study ...

  7. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a size ratio called optical magnification. When this number is less than one, it refers to a reduction in size, sometimes called de-magnification .

  8. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour). [Note 3] According to the special theory of relativity, c is the upper limit for the speed at which ...

  9. Points of Light - Wikipedia

    en.wikipedia.org/wiki/Points_of_Light

    t. e. Points of Light presentation in the East Room of the White House in January 1993. Points of Light is an international nonprofit, nonpartisan organization headquartered in Georgia, United States dedicated to engaging more people and resources in solving serious social problems through voluntary service. Each year, Points of Light mobilizes ...

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