In 1821, Alexis Bouvard published astronomical tables of the orbit of Neptune's neighbour Uranus. Subsequent observations revealed substantial deviations from the tables, leading Bouvard to hypothesise that an unknown body was perturbing the orbit through gravitational interaction. In 1843, John Couch Adams began work on the orbit of Uranus using the data he had. Via Cambridge Observatory director James Challis, he requested extra data from Sir George Airy, the Astronomer Royal, who supplied it in February 1844. Adams continued to work in 1845–46 and produced several different estimates of a new planet. COUNT 5
QSN1 What year did Alexis Bouvard publish relevant astronomical tables?  ANS1 1821 QSN2 What did Alexis Bouvard study?  ANS2 the orbit of Neptune's neighbour Uranus QSN3 When did John Couch Adams begin working on the orbit of Uranus?  ANS3 1843 QSN4 Who gave John Couch Adams extra data?  ANS4 Sir George Airy QSN5 What did the extra data John Couch Adams received produce?  ANS5 several different estimates of a new planet