It was 21 March 2013. The world’s scientific press had either gathered in ESA’s Paris headquarters or logged in online, along with a multitude of scientists around the globe, to witness the moment when ESA’s Planck mission revealed its ‘image’ of the cosmos. This image was taken not with visible light but with microwaves.
via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Planck/From_an_almost_perfect_Universe_to_the_best_of_both_worlds
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