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No one "discovered" that fact, it was agreed upon by a gathering of planetary scientists. They chose to limit the definition of what a "planet" was. Under the new definition Pluto was excluded.
The rules of a planet are:
- It orbits the Sun
- It is large enough for gravity to squash it into a sphere
- It must have cleared its orbit
This last is the one that Pluto does not comply with. There are many other objects in Pluto's orbital path.
What else can I help you with?
How was the planet Pluto discovered?
pluto was discovered in 1930
What starting with p a planet discovered by an astronomer in 1930?
Pluto was a planet discovered in 1930
When was Pluto made a planet?
Pluto was discovered in 1930 and assumed to be a planet at that time.
What is the newest planet discovered?
Pluto, Discovered in 1930
What planet discovered by an astronmer in 1930?
planet pluto
Which planet was last to be discovered?
Pluto
What planet was discovered with a telescope?
Pluto
What planet was not discovered in 1846?
Pluto
In What year and by whom was the planet pluto discovered?
The dwarf planet Pluto was discovered in the year 1930. It was discovered by Clyde Tombaugh and is the largest object found in the Kuiper belt.
What was discovered in year 2003?
Pluto the 10th planet was discovered
When was Pluto the dwarf planet discovered?
An American astronomer named Clyde Tombaugh discovered Pluto in 1930
What starting with P is the planet discovered by astronomer in 1930?
That's Pluto. Note that it is not currently considered a planet, but after it was discovered, it was generally considered to be one.
