Context: 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.

Question: What year did Alexis Bouvard publish relevant astronomical tables? 
Answer: 1821

Question: What did Alexis Bouvard study? 
Answer: the orbit of Neptune's neighbour Uranus

Question: When did John Couch Adams begin working on the orbit of Uranus? 
Answer: 1843

Question: Who gave John Couch Adams extra data? 
Answer: Sir George Airy

Question: What did the extra data John Couch Adams received produce? 
Answer: several different estimates of a new planet

Question: What did Alexis Bouvard publish in the 18th century?
Answer: Unanswerable

Question: Who published astronomical tables of Neptunes orbit?
Answer: Unanswerable

Question: Who gave Sir George  Airy extra data?
Answer: Unanswerable

Question: What did Sir George Airy produce with the extra data?
Answer: Unanswerable

Question: What happened in 1831?
Answer: Unanswerable

Question:  What did Alexis Bouvard teach?
Answer: Unanswerable

Question: When did John Couch Adams begin working on the orbit of Neptune?
Answer: Unanswerable

Question:  Who took away John Couch Adams' data?
Answer: Unanswerable

Question: What happened in February 1855?
Answer: Unanswerable