The last planet to discover during the 20th century was Pluto. But it's a dwarft planet so it should maybe be Neptune.
At the end of the 17th century the furthest planet known was Saturn, and it had been known in ancient times. Uranus was discovered in 1783, Neptune in 1846.
Yes. It is the last year of the 19th century.
The planet Neptune was the second last planet to be discovered in our solar system. It was officially discovered in 1846 by Johann Gottfried Galle, based on mathematical predictions by Urbain Le Verrier.
As we are discovering more and more exoplanets almost weekly, there will never be a "last" planet discovered.
1900 was the last year of the 19th century.
Pluto
The year 1899 was the last year of the 19th century.
Neptune, Pluto, Or planet X (Or Nibiru) are discovered. On the future, Nibiru is discovered. The Future Year: 2111
neptune i belive
In "modern times" as we know them, Uranus was the first planet discovered. All the other planets known to then were visible to the naked eye from earth, and, thus, were known to ancients. It is exceptionally dim and moves very slowly in its orbit. Uranus was discovered by William Hershel, who saw it in a telescope and announced his discovery on March 13, 1781. The Neptune was discovered in 1846.
9th century to almost the 19th century.