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Olbers's paradox says that because the night sky is dark, at least one of these three assumptions must be false. Olbers's paradox , also known as the dark night paradox or Olbers and Cheseaux's paradox , is an argument in astrophysics and physical cosmology that says the darkness of the night sky conflicts with the assumption of an infinite and ...
Paranal Observatory nights. [3] The concept of noctcaelador tackles the aesthetic perception of the night sky. [4]Depending on local sky cloud cover, pollution, humidity, and light pollution levels, the stars visible to the unaided naked eye appear as hundreds, thousands or tens of thousands of white pinpoints of light in an otherwise near black sky together with some faint nebulae or clouds ...
The terms UFO, flap, and wave allow for sightings of various unrelated phenomena in the night sky to be discussed as if they are parts of the same aerial event. [5] [6] Documenting the provenance of the idea of UFO flap, Wired journalist Sarah Scoles identified how the term was first associated with the 1947 flying saucer craze:
Galle is a crater on Mars.It is located on the eastern rim of the huge impact basin Argyre Planitia in Argyre quadrangle.It is named after the German astronomer Johann Gottfried Galle. [1]
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...
Many features of the night sky are named for the "children of Dôn" the ancient mother goddess and sky goddess, with the Milky Way being associated with Gwydion ab Dôn (the son of Dôn), and named Caer Gwydion ("The fortress/city of Gwydion") or Llwybr Caer Gwydion ("the path to the Castle of Gwydion"). [36] [37]
Cassiopeia (listen ⓘ) is a constellation and asterism in the northern sky named after the vain queen Cassiopeia, mother of Andromeda, in Greek mythology, who boasted about her unrivaled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy , and it remains one of the 88 modern constellations today.
At V band, the emission from airglow is V = 22 per square arc-second at a high-altitude observatory on a moonless night; in excellent seeing conditions, the image of a star will be about 0.7 arc-second across with an area of 0.4 square arc-second, and so the emission from airglow over the area of the image corresponds to about V = 23.