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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.
The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyrus texts of Greek horoscopes are a circle with one ray for the Sun and a crescent for the Moon. [3] The modern Sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance. [3]
The Hubble Deep Field was produced in 1995 from images accumulated when the Hubble Space Telescope observed one very small patch of sky over 10 days. Almost every object seen in the HDF is a distant galaxy; only a few local stars contaminate the field.
Astrophotography, also known as astronomical imaging, is the photography or imaging of astronomical objects, celestial events, or areas of the night sky. The first photograph of an astronomical object (the Moon) was taken in 1839, [1] but it
Portal:Astronomy/Picture/7 August 2005. Cigar galaxy, complements of NASA. The Cigar Galaxy is an irregular galaxy 12 million light years away. It can also be called M82 or NGC 3034. The galaxy is a starburst galaxy in the Ursa Minor constellation. This image was obtained as part of the Two Micron All Sky Survey. 9 August 2005 . 10 August 2005
Galaxy 1.88 Alpha Trianguli Australis: Star 1.90 1.89 Beta Aurigae: Binary star system 1.918 Alpha Pavonis: Binary star system 1.92 Gamma Geminorum: Binary star system 1.95 [17] Delta Velorum: Triple star system Maximum brightness; 96% chance of being a quadruple star system 1.97 1.87 Beta Canis Majoris: Star 1.97 Alphard: Star 2.00 [7] 1.84 ...
Maya astronomy is the study of the Moon, planets, Milky Way, Sun, and astronomical phenomena by the Precolumbian Maya civilization of Mesoamerica.The Classic Maya in particular developed some of the most accurate pre-telescope astronomy in the world, aided by their fully developed writing system and their positional numeral system, both of which are fully indigenous to Mesoamerica.
In ancient times, only the Sun and Moon, a few stars, and the most easily visible planets had names. Over the last few hundred years, the number of identified astronomical objects has risen from hundreds to over a billion, and more are discovered every year.