Night sky night sky. Aircraft are also visible at night, distinguishable at a distance from other objects because their lights blink. Night sky The term night sky, usually associated with astronomy from Earth, refers to 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 polar circles. Occasionally, a large coronal mass ejection from the Sun or simply
Northern Lights (pipeline) Beltransgaz. Northern Lights (pipeline) Northern Lights () is a natural gas pipeline system in Russia and Belarus. It is one of the main pipelines supplying north-western Russia and is an important transit route for Russian gas to Europe. The Northern Lights pipeline system was built in the Soviet Union from the 1960s to 1980s. Construction of the Vuktyl–Ukhta–Gryazovets–Torzhok section started in 1967 and was completed in 1969. By 1974, the pipeline had been extended to Minsk. The second main trunk line was added during the 1970s and by 1985, a third main trunk line had been built. Originally, gas was