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
Mining in the Northern Territory Mining in the Northern Territory Mining in the Northern Territory accounts for 16.4% of the gross domestic product, inclusive of both the minerals at petroleum industries. In 2015, it was valued at A$3,436 million. It accounts for 4.3% of the Northern Territory workforce. 63 businesses are currently engaged in the sector. Prior to European Settlement Indigenous groups mined ochre and other materials for ceremonial activities. With the arrival of the overland telegraph in the 1860s - 70's gold was discovered Manganese mining in the Northern Territory in the financial year 2013-14, was worth A$1,024 million. Petroleum, like mining, falls under