Helge Kragh gained doctoral degrees in physics (1981) and in philosophy (2007). He was a high school teacher in physics and chemistry (1970-87), and then later a professor of history of science at Cornell University, USA; University of Oslo, Norway; and University of Aarhus, Denmark (1987-2015). After retiring, he is now emeritus professor at the Niels Bohr Institute, University of Copenhagen, Denmark.Malcolm Longair is Director of Development and Outreach, Jacksonian Professor Emeritus of Natural Philosophy at the Cavendish Laboratory, University of Cambridge, UK. He also holds the position of Editor-in-Chief of the Biographical Memoirs of Fellows of the Royal Society (2016-2020). Longair has previously held positions as a university lecturer in the Department of Physics, University of Cambridge (1970--80); Astronomer Royal for Scotland, Regius Professor of Astronomy, University of Edinburgh, Director of the Royal Observatory, Edinburgh (1980-90); Jacksonian Professor of Natural Philosophy, University of Cambridge (1991--2008); andHead of Cavendish Laboratory (1997--2005).

• 1: Helge Kragh: Cosmological theories before and without Einstein 2: Robert W. Smith: Observations and the universe 3: Matteo Realdi: Relativistic models and the expanding universe 4: Helge Kragh: Alternative cosmological theories 5: Helge Kragh: Steady state theory and the cosmological controversy 6: Malcolm Longair: Observational and astrophysical cosmology: 1940 to 1980 7: Malcolm Longair: Relativistic astrophysics and cosmology 8: Bruce Partridge: The cosmic microwave background: From discovery to precision cosmology 9: Silvia de Bianchi: Space science and technological progress: Testing theories of relativistic gravity and cosmology during the Cold War 10: Malcolm Longair: Observational and astrophysical cosmology: 1980 to 2018 11: Malcolm Longair and Chris Smeenk: Inflation, dark matter, and dark energy 12: Milan M. Cirkovic: Stranger things: Multiverse, string theory, physical eschatology 13: Chris Smeenk: Philosophical aspects of cosmology

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Helge Kragh gained doctoral degrees in physics (1981) and in philosophy (2007). He was a high school teacher in physics and chemistry (1970-87), and then later a professor of history of science at Cornell University, USA; University of Oslo, Norway; and University of Aarhus, Denmark (1987-2015). After retiring, he is now emeritus professor at the Niels Bohr Institute, University of Copenhagen, Denmark.Malcolm Longair is Director of Development and Outreach, Jacksonian Professor Emeritus of Natural Philosophy at the Cavendish Laboratory, University of Cambridge, UK. He also holds the position of Editor-in-Chief of the Biographical Memoirs of Fellows of the Royal Society (2016-2020). Longair has previously held positions as a university lecturer in the Department of Physics, University of Cambridge (1970--80); Astronomer Royal for Scotland, Regius Professor of Astronomy, University of Edinburgh, Director of the Royal Observatory, Edinburgh (1980-90); Jacksonian Professor of Natural Philosophy, University of Cambridge (1991--2008); andHead of Cavendish Laboratory (1997--2005).

• 1: Helge Kragh: Cosmological theories before and without Einstein 2: Robert W. Smith: Observations and the universe 3: Matteo Realdi: Relativistic models and the expanding universe 4: Helge Kragh: Alternative cosmological theories 5: Helge Kragh: Steady state theory and the cosmological controversy 6: Malcolm Longair: Observational and astrophysical cosmology: 1940 to 1980 7: Malcolm Longair: Relativistic astrophysics and cosmology 8: Bruce Partridge: The cosmic microwave background: From discovery to precision cosmology 9: Silvia de Bianchi: Space science and technological progress: Testing theories of relativistic gravity and cosmology during the Cold War 10: Malcolm Longair: Observational and astrophysical cosmology: 1980 to 2018 11: Malcolm Longair and Chris Smeenk: Inflation, dark matter, and dark energy 12: Milan M. Cirkovic: Stranger things: Multiverse, string theory, physical eschatology 13: Chris Smeenk: Philosophical aspects of cosmology

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Helge Kragh gained doctoral degrees in physics (1981) and in philosophy (2007). He was a high school teacher in physics and chemistry (1970-87), and then later a professor of history of science at Cornell University, USA; University of Oslo, Norway; and University of Aarhus, Denmark (1987-2015). After retiring, he is now emeritus professor at the Niels Bohr Institute, University of Copenhagen, Denmark.Malcolm Longair is Director of Development and Outreach, Jacksonian Professor Emeritus of Natural Philosophy at the Cavendish Laboratory, University of Cambridge, UK. He also holds the position of Editor-in-Chief of the Biographical Memoirs of Fellows of the Royal Society (2016-2020). Longair has previously held positions as a university lecturer in the Department of Physics, University of Cambridge (1970--80); Astronomer Royal for Scotland, Regius Professor of Astronomy, University of Edinburgh, Director of the Royal Observatory, Edinburgh (1980-90); Jacksonian Professor of Natural Philosophy, University of Cambridge (1991--2008); andHead of Cavendish Laboratory (1997--2005).

• 1: Helge Kragh: Cosmological theories before and without Einstein 2: Robert W. Smith: Observations and the universe 3: Matteo Realdi: Relativistic models and the expanding universe 4: Helge Kragh: Alternative cosmological theories 5: Helge Kragh: Steady state theory and the cosmological controversy 6: Malcolm Longair: Observational and astrophysical cosmology: 1940 to 1980 7: Malcolm Longair: Relativistic astrophysics and cosmology 8: Bruce Partridge: The cosmic microwave background: From discovery to precision cosmology 9: Silvia de Bianchi: Space science and technological progress: Testing theories of relativistic gravity and cosmology during the Cold War 10: Malcolm Longair: Observational and astrophysical cosmology: 1980 to 2018 11: Malcolm Longair and Chris Smeenk: Inflation, dark matter, and dark energy 12: Milan M. Cirkovic: Stranger things: Multiverse, string theory, physical eschatology 13: Chris Smeenk: Philosophical aspects of cosmology

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