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Laundry detergent fluorescing under ultraviolet light. Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) through the ...
Dawn begins with the first sight of lightness in the morning, and continues until the Sun breaks the horizon. The morning twilight is divided in three phases, which are determined by the angular distance of the centre of the Sun (degrees below the horizon) in the morning.
The Blind Milton (Thomas Uwins, c. 1817) "When I Consider How My Light is Spent" (also known as "On His Blindness") is one of the best known of the sonnets of John Milton (1608–1674).
Gravitational microlensing is an astronomical phenomenon caused by the gravitational lens effect. It can be used to detect objects that range from the mass of a planet to the mass of a star, regardless of the light they emit.
A filtered image of the Sun in visible light, showing the limb-darkening effect as a dimmer luminosity towards the edge or limb of the solar disk. The image was taken during the 2012 transit of Venus (seen here as the dark spot at the upper right).
Sun glitter was discovered on Titan's smallest sea, Punga Mare, in 2014 as a set of brightened pixels at infrared wavelengths across Punga Mare's bright sea surface. [3] The glitter was likely caused by springtime winds. [3] Sun glitter has also been observed in the largest sea, Kraken Mare, during the northern summer. [4]
Marine cloud brightening is based on phenomena that are currently observed in the climate system. Today, emissions particles mix with clouds in the atmosphere and increase the amount of sunlight they reflect, reducing warming.
Acropolis of Athens illuminated at night Illuminated cherry blossoms, light from the shop windows, and Japanese lantern at night in Ise, Mie, Japan. Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects.