Not yet. Scientists have discovered evidence that a large planet roughly 10 times the mass of Earth might exist far beyond the orbits of the other planets. So far we have not proven its existence. We may have to wait until the year 2020 before we find it.
No, Pluto was the ninth planet, but now, there is no ninth planet in this Solar System, since Pluto got turned into a dwarf planet. Your anus is a planet.
Neptune is the eighth planet. Pluto, formerly the ninth planet, is no longer considered a planet.
The ninth planet of our solar system was Pluto. However - the planet was downgraded from planet status, and is now considered part of the Kepler belt.
Back when Pluto was a planet and not a dwarf planet, it sometimes Neptune to be the ninth planet because their orbit crossed. Now that Pluto is a dwarf planet, there are only eight planets in the solar system.
"The ninth plant" is meaningless, since there's no natural ordering for plants."The ninth planet" is also meaningless, because there are only eight solar planets, and there's no natural ordering for planets in general. "The ninth planet around the star Mumbojumbo" might have some meaning, assuming that a) there were a star named Mumbojumbo and b) it had at least nine planets, but as it is, your question cannot be answered.
pluto
No
Pluto
Pluto has been recategorised as a dwarf planet. Until its change in status it was considered to be the ninth planet from the sun. Though, on occasion, its orbit brought it closer than to the sun than Neptune, the eighth planet.
From it's discovery in 1930 until 2006, Pluto was the ninth planet. In 2006 it was reclassified as a 'dwarf planet','so is no longer a 'planet'. There are only eight bodies in our solar system now internationally recognised as planets.
No. The fifth planet is Jupiter. Pluto was once considered the ninth planet, but is no longer considered a planet.
Copernicus dis not discover that Jupiter was a planet. It was always known to be a planet, though for the longest time we did not know what a planet was.