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This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
The Star on the Mountain is a man-made star-shaped landmark on the Franklin Mountains in El Paso, Texas, that is illuminated nightly by the El Paso Chamber.It was first lit as a Christmas decoration in 1940 and was meant as a reminder to people on both sides of the nearby Mexico–United States border that America was at peace during the holiday season.
A star trail is a type of photograph that uses long exposure times to capture diurnal circles, the apparent motion of stars in the night sky due to Earth's rotation. A star-trail photograph shows individual stars as streaks across the image, with longer exposures yielding longer arcs .
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When the Earth is at maximum phase, the total radiance at the lunar surface is approximately 0.15 W m −2 from Earthlight. This is only 0.01% of the radiance from direct Sunlight. [ 4 ] Earthshine has a calculated maximum apparent magnitude of −3.69 as viewed from Earth.
Cloudy night sky without moon [4] 400 μcd/m 2 "Darkest sky" [5] 1 mcd/m 2: Night sky [6] 1.4 mcd/m 2: Typical photographic scene lit by full moon [7] 10 −2: 5 mcd/m 2: Approximate scotopic/mesopic threshold [8] 10 −1: 10 0: cd/m 2: 2 cd/m 2: Floodlit buildings, monuments, and fountains [9] 10 1: 5 cd/m 2: Approximate mesopic/photopic ...
This is a list of star systems within 100–150 light years of Earth. This list is incomplete; you can help by adding missing items. (July 2024) Star system ...
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