Double Planet

John Gribbin is a British science writer, astrophysicist and visiting fellow in astronomy at the University of Sussex, where he graduated with a BA in physics in 1966 and did his master of science (MSc) in 1967. He earned his PhD in astrophysics from the University of Cambridge in 1971. Author of the well-known IN SEARCH OF SCHRODINGER'S CAT, Gribbin's work as a scientist is often reflected in his writing which covers a wide range of topics, such as quantum physics, human evolution, the origins of the universe, climate change and global warming. Marcus Chown (1959 - )Marcus Chown graduated from the University of London in 1980 with a first class degree in physics.
He also earned a Master of Science in astrophysics from the California Institute of Technology. Currently the cosmology consultant for New Scientist magazine, Chown has co-authored two hard SF novels with John Gribbin: Double Planet and its remote sequel Reunion.