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Image Astro du jour
At first glance, it may look as though we’re about to enter the Milky Way. However, today’s Picture of the Week actually features the road sign indicating the entrance to the ALMA Observatory, in Chile’s Atacama Desert. The Atacama Large Millimeter/submillimeter Array (ALMA), which is operated by ESO together with international partners, studies the light from the coldest corners of the Universe.
Water vapour in Earth’s atmosphere readily absorbs the millimetre and submillimetre wavelengths of radiation that ALMA observes. This is why ALMA is located in one of the driest and highest places on Earth, on the Chajnantor Plateau in the Andes, at an impressive altitude of 5000 metres.
ALMA has given us some of the most detailed images of our Milky Way, showing among other things filaments of dense clouds of gas and dust at its core. Unlike our eyes, or a camera like the one that took this photo, ALMA uses a technique called interferometry that allows us to see fine details of distant celestial objects. By combining the light captured with each of the 66 high-precision antennas in its array, ALMA works as a single telescope with a diameter equal to the farthest distance between antennas.
While not being able to physically reach the glowing band of our galaxy seen in this picture, images like the ones produced by ALMA are some of the closest "gateways” we have to admire the Milky Way and its constituents.