«DARKNESS»

Darkness, the polar opposite of brightness, is understood as a lack of illumination or an absence of visible light. Human vision is unable to distinguish color in conditions of either high brightness or very low brightness.[1] In conditions with insufficient light levels, color perception ranges from achromatic to ultimately black…..

The emotional response to darkness has generated metaphorical usages of the term in many cultures.



Referring to a time of day, complete darkness occurs when the Sun is more than 18° below the horizon, without the effects of twilight on the night sky. A dark area has limited light sources, making things hard to see. Exposure to alternating light and darkness (night and day) has caused several evolutionary adaptations to darkness. When a vertebrate, like a human, enters a dark area, its pupils dilate, allowing more light to enter the eye and improving night vision. Also, the light detecting cells in the human eye (rods and cones) will regenerate more unbleached rhodopsin when adapting to darkness……

One scientific measure of darkness is the Bortle Dark-Sky Scale, which indicates the night sky’s and stars’ brightness at a particular location, and the observability of celestial objects at that location. (See also: Sky brightness)



The material known as Vantablack is one of the darkest substances known, absorbing up to 99.965% of visible light (at 663 nm if the light is perpendicular to the material) is a material developed by Surrey NanoSystems in the United Kingdom.[4][5] The name is a compound of the acronym VANTA (vertically aligned nanotube arrays)[6] and the color black….

……Thank you……

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