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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 ...
night sky The appearance of the Earth's sky at nighttime, when the Sun is below the horizon, and more specifically when clear weather and low levels of ambient light permit visibility of celestial objects such as stars, planets, and the Moon. The night sky remains a fundamental setting for both amateur and professional observational astronomy.
Sirius. Ancient Greek: Σείριος 'the scorcher'; in Egyptian Sopdet, rendered in Greek as ΣῶθιςSōthis. 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).
The day 's blue sky, clouds and the Moon. 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.
Sirius is the brightest star in the night sky. Its name is derived from the Greek word Σείριος (Latin script: Seirios), meaning lit. 'glowing' or 'scorching'. The star is designated α Canis Majoris, Latinized to Alpha Canis Majoris, and abbreviated α CMa or Alpha CMa.
Betelgeuse is the brightest near-infrared source in the sky with a J band magnitude of −2.99; [ 95 ] only about 13% of the star's radiant energy is emitted as visible light. If human eyes were sensitive to radiation at all wavelengths, Betelgeuse would appear as the brightest star in the night sky.
With an apparent visual magnitudeof −0.05, Arcturus is the brightest star in the northern celestial hemisphereand the fourth-brightest starin the night sky,[14]after Sirius(−1.46 apparent magnitude), Canopus(−0.72) and α Centauri(combined magnitude of −0.27). However, α Centauri AB is a binary star, whose components are each fainter ...