Obituary of Arno Penzias
American astrophysicist and Nobel laureate Arno Penzias, who has died aged 90, was responsible for one of the greatest cosmological revelations of the 20th century: the discovery of the cosmic microwave background, the leftover radiation from the Big Bang. He first demonstrated its existence in 1965 with his collaborator Robert Wilson, and five years later—along … Read more