SANTIAGO (Reuters) – Chilean authorities on Thursday said they found the body of a British astronomer who went missing in mid-September at an observatory in the north of the country, where he had arrived for a scientific research visit. Authorities conducted an extensive search for Thomas Marsh, of the University of Warwick, across a vast area of the La Silla observatory, located in an arid, mountainous area 600 kilometers (373 miles) north of Chile’s capital, Santiago. “After an intense search by a multidisciplinary team police officers (…) found the lifeless body of an astronomer missing s…