Countries do not discover planets, people do. Of the planets that aren't visible with the naked eye, the discoverers lived in England (Uranus) and Germany (Neptune), and the USA if we count Pluto.
Pluto was discovered in 1930. At the time it was considered to be a planet, but it is now considered a dwarf planet.
Pluto was discovered by the American Clyde W. Tombaugh, but it is no longer a planet.
Uranus was the first planet to be discovered in 1781.
Pluto, now officially considered a "dwarf planet", was discovered by Clyde Tombaugh at Lowell Observatory in Flagstaff, AZ, in 1930.
Saturn was the first planet discovered to have rings.
Planet Mars has never discovered anything!
As we are discovering more and more exoplanets almost weekly, there will never be a "last" planet discovered.
It was never "discovered", the Egyptians had known about it since it was created. So technically even if a foreign country saw it it was never really discovered.
Mars, the planet, was first travelled to in 1965 by Mariner 4 (a spacecraft) by the country USA from NASA.
Yes, the Teletubbies are from Teletubbyland. It is never said whether Teletubbyland is a country or a planet. If it was supposed to be a country, the planet's name remains unknown.
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".
William herschel discovered the planet uranus
The planet Uranus was discovered in 1781 by William Herschel.
THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH
The planet Neptune was discovered in 1846.
I think planet x was the last to be discovered. Not sure