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Image Astro du jour
The glowing streak of the Milky Way splashes across the Chilean sky in today’s Picture of the Week. The telescope gazing in admiration is the Danish 1.54-meter telescope, hosted at ESO’s La Silla Observatory. This telescope has previously imaged some of the cosmic marvels we can see in this picture. The Carina Nebula can be seen glittering pink at the bottom of the Milky Way band. And at the top of the image we can see the bright, star-forming Lagoon Nebula.
From La Silla’s location in the southern hemisphere, the bright core of the Milky Way passes directly overhead. The dark patches we see across the glowing centre are caused by clouds of interstellar dust and gas, which absorb light from the galactic centre on its way to Earth.
Do not worry, the green glow we see in this image is not a result of urban light pollution. This is a natural phenomenon known as airglow, caused by interactions between the Sun’s light and molecules in the atmosphere. This faint light is invisible to the human eye but appears in photographs like this one.