Planet x

Meaning

Name

●

A

in the Solar system, beyond the

known

. (The

was

to Eris for a

while, when Pluto was still considered the

.)

●

A

for

of Neptune's

. (This was

to be Pluto. The

were an error.)

●

A

for

of Uranus'

. (This

was

and is now known as Neptune.)

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