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The photograph depicts a lush green rolling hill with cirrus clouds during a daytime sky, with mountains far in the background. [1] [2] It was taken by Charles O'Rear, a former National Geographic photographer and resident of St. Helena, California, in the Napa Valley region north of San Francisco, while on his way to visit his girlfriend in ...
List of brightest natural objects in the sky. 3 languages. ... HD 84810: Star 4.07 3.48 Delta Cephei: Quadruple star system 4.24 3.3 Chi Cygni: Star 4.97 3.5 R Hydrae:
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The sky is the denser gaseous zone of the Earth’s atmosphere. Sky can be depicted as many different colors , such as a pale blue or the lack of any color at all, such as the night sky, which has the appearance of blackness, albeit with a scattering of stars on a clear night.
Historical brightest stars, the brightest star in Earth's night sky at each period within the last or next 5 million years; Limiting magnitude; List of variable stars; List of semiregular variable stars; List of stars that have unusual dimming periods; List of brightest natural objects in the sky; List of largest stars; List of most massive stars
Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. The fact that the sky is not completely dark at night is easily visible. If light sources (e.g. the Moon and light pollution ) were removed from the night sky , only direct starlight would be visible.
A truly dark sky has a surface brightness of 2 × 10 −4 cd m −2 or 21.8 mag arcsec −2. [ 9 ] [ clarification needed ] The peak surface brightness of the central region of the Orion Nebula is about 17 Mag/arcsec 2 (about 14 milli nits ) and the outer bluish glow has a peak surface brightness of 21.3 Mag/arcsec 2 (about 0.27 millinits).
The area of sky that the Milky Way obscures is called the Zone of Avoidance. [67] The Milky Way has a relatively low surface brightness. Its visibility can be greatly reduced by background light, such as light pollution or moonlight. The sky needs to be darker than about 20.2 magnitude per square arcsecond in order for the Milky Way to be ...