As we are discovering more and more exoplanets almost weekly, there will never be a "last" planet discovered.
I think planet x was the last to be discovered. Not sure
Pluto
Neptune, Pluto, Or planet X (Or Nibiru) are discovered. On the future, Nibiru is discovered. The Future Year: 2111
neptune i belive
It wasn't discovered to not be a planet, it was decided to no longer be a planet. Recently, the last 2 or 3 years scientist decided (not all) it was not an official planet.
Neptune.
The last planet to discover during the 20th century was Pluto. But it's a dwarft planet so it should maybe be Neptune.
The most metallic element on the planet is Francium. It is the last element to be discovered that was not made synthetically.
Neptune. (Note: Pluto was discovered later, but currently it is no longer recognized as a planet.)
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.
Which planet?
No planet was discovered in 1932. You probably mean Pluto. That was discovered in 1930. It has since been downgraded to a "dwarf planet".