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
County of Northern Lights of 3,555. As a census subdivision in the 2011 Census of Population, Northern Lights had a population of 4,117 living in 1,527 of its 1,655 total dwellings, a 9.1% change from its 2006 population of 3,772. This includes the population of the Paddle Prairie Metis Settlement (562) located within the census subdivision that is a municipality independent of the County of Northern Lights. With a land area of , the census subdivision had a population density of in 2011. As a municipality in the 2011 Census, the County of Northern Lights had a population of 3,555 without the Paddle Prairie