What planet was the first to be discovered by mathematical prediction and not observation?

More Questions:

The Stasi were an intelligence organisation in what country?

In music, what does a legato mean?

Who wrote :The Tale of Peter Rabbit"?

In which US state is Mount Vernon?

Libreville is the capital of which country?

Mauritania is in which continent?

Lesotho is landlocked by which African country?

What kind of animal was the now extinct Dodo?

How many pounds of jet fuel does a passenger Boeing 747 use during take off?

What actor did Michael J. Fox replace as Marty McFly in "Back to the Future"?

In Disney's "Cinderella', what is the cats name?

Who was the first African-American to be appointed as a US Supreme Court justice?

What Ken Kesey-led group toured American in a psychedelic school bus called "Further"?

What two planets in our Solar System possess no moons?

What year did Beethoven finish composing Symphony No. 9?