What proof is there yet by Nasa that there is another planet on the other side of...

?

.^.

New member
...Mercury called "Vulcan"? what is known too about this planets size and other things?

why havent confirmed it yet?

also, where else another planet might be? and how large?

please explain what you can about the history of planets discoveries and what it takes for a planet to be considered a planet? why Pluto suddenly isnt a planet anymore? what about Chiron? why it is considered only a "planetoid"? what his that?

thanks for your answers!
 
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