The Coalsack Nebula is one of the best known dark nebulae in the sky, along with the nearby Dark Doodad Nebula and the Horsehead Nebula. The Coalsack is located in the southern constellation Crux and overlaps into the neighbouring constellations Musca and Centaurus.
The dark cloud of cold gas and dust lies at a distance of 600 light years from Earth and is about 30 to 35 light years across.
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Centaurus A is a peculiar galaxy located in the southern constellation Centaurus. It is the fifth brightest galaxy in the night sky, the nearest giant galaxy to the Milky Way, and one of the nearest radio galaxies to Earth.
Its exact type is uncertain, but it is usually classified either as a giant elliptical or lenticular galaxy. The galaxy’s exact distance from Earth is also uncertain, but estimates generally range from 10 to 16 million light years.
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Alpha Centauri is the nearest star system to the Sun, located at a distance of only 4.37 light years or 1.34 parsecs from Earth. It is the brightest star in Centaurus constellation and the third brightest star in sky.
The Southern Cross is one of the best known asterisms in the night sky, and the most familiar star pattern in the southern hemisphere. The asterism is one of the easiest to identify in the sky and it has significance in a number of cultures in the southern latitudes.
Composed of five stars forming the shape of a cross, it is the most distinctive feature of the constellation Crux, the smallest constellation in the sky. The Southern Cross is notable for containing two bright stars, Acrux and Gacrux, which point the way to the Southern Celestial Pole.
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