The predicted location of Neptune was made possible because?

Answer 1

Newton's Universal Gravitation and anomalies in Uranus' orbit. J.C. Adams and U.J.J. Le Verrier noticed anomalies in Uranus' orbit and attributed those to another unseen planet pulling on it. That hypothesis isn't possible without the acceptance of Universal Gravitation.

Answer 2

the predicted location of Neptune was made possible through mathematical calculations based on perturbations in the orbit of Uranus. These perturbations led astronomers to predict the presence of another planet exerting gravitational influence on Uranus, which ultimately led to the discovery of Neptune.

Answer 3

of the use of radio telescope (: I think...

Answer 4

of the use of radio telescope