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The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon . Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...
Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website. The coordinating researchers compile this ...
Aurora. An aurora[ a] ( pl. aurorae or auroras ), [ b] also commonly known as the northern lights ( aurora borealis) or southern lights ( aurora australis ), [ c] is a natural light display in Earth 's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic ).
The Blue Marble is a photograph of Earth taken on December 7, 1972, by either Ron Evans or Harrison Schmitt aboard the Apollo 17 spacecraft on its way to the Moon. Viewed from around 29,400 km (18,300 mi) from Earth's surface, [ 1] a cropped and rotated version has become one of the most reproduced images in history. [ 2][ 3]
Earthlight is the diffuse reflection of sunlight reflected from Earth 's surface and clouds. Earthshine (an example of planetshine ), also known as the Moon's ashen glow, is the dim illumination of the otherwise unilluminated portion of the Moon by this indirect sunlight. Earthlight on the Moon during the waxing crescent is called "the old Moon ...
Northern Lights and meteors illuminate night sky. Stargazers in Wales who stayed out late to catch a glimpse of the Perseid meteor shower were also treated to a Northern Lights display overnight ...
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Earthquake light. An earthquake light also known as earthquake lightning or earthquake flash is a luminous optical phenomenon that appears in the sky at or near areas of tectonic stress, seismic activity, or volcanic eruptions. [ 1] There is no broad consensus as to the causes of the phenomenon (or phenomena) involved.