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The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere.
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 ...
Sirius. Ancient Greek: Σείριος 'the scorcher'; in Egyptian Sopdet, rendered in Greek as Σῶθις Sōthis. As the brightest star in the sky, Sirius has proper names in numerous cultures, including Polynesian (Māori: Takurua; Hawaiian: Ka'ulua ('Queen of Heaven'), among others). Also known as the "Dog Star".
Aurora australis seen from the ISS, 2017 [1]. 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).
Each of the seven heavens corresponds to one of the seven classical planets known in antiquity. Ancient observers noticed that these heavenly objects (the Moon, Mercury, Venus, the Sun, Mars, Jupiter, and Saturn) moved at different paces in the sky both from each other and from the fixed stars beyond them. Unlike comets, which appeared in the ...
Star chart. A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [1] They have been used for human navigation since time immemorial. [2]
The area of sky that the Milky Way obscures is called the Zone of Avoidance. [60] 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 ...
The northern celestial hemisphere, also called the Northern Sky, is the northern half of the celestial sphere; that is, it lies north of the celestial equator. This arbitrary sphere appears to rotate westward around a polar axis due to Earth's rotation. At any given time, the entire Northern Sky is visible from the geographic North Pole, while ...