The Neptune File

by Tom Standage

A Story of Astronomical Rivalry and the Pioneers of Planet HuntingThe Neptune File is the first full account of the dramatic events surrounding the eighth planet’s discovery, and the story of two remarkable men who were able to “see” on paper what astronomers looking through telescopes for more than 200 years had never seen.On June 26, 1841, John couch Adams, a brilliant young mathematician at Cambridge University, chanced upon a report by England’s Astronomer Royal, George Airy, describing unsuccessful attempts to explain the mystifying orbital behavior of the planet Uranus, discovered 65 years earlier. Adams theorized that Uranus’s orbit was being affected by the gravitational pull of another, as-yet-unseen planet. Furthermore, he believed that he did not need to see the planet to know where it was. Four years later, his daring mathematical calculations pinpointed the planet’s location, but Airy failed to act on them—a controversial lapse that would have international repercussions.S