NO! NO!
Dark Planet was created in 2007.
The Umbra is completely dark. Partially Dark is Penumbra.
The planet with a great dark spot that disappeared in 1994 was Neptune. The dark spot was a massive storm system in Neptune's atmosphere, similar to Jupiter's Great Red Spot. It was first observed by the Voyager 2 spacecraft in 1989 and had completely disappeared by 1994.
Not unless you have a definition of "completely dark" that means something other than completely dark (i.e. no light whatsoever).
pluto.
Dark Planet - 1998 was released on: USA: September 1998
When the moon appears completely dark it is called a new moon.
You can go to the dried-up dark lake on Fons or in Malik.
Planet Neptune
Dark Planet - 1982 VG was released on: USA: October 1982
Saturn is the planet that will answer your question
The small dark planet named after the god of the dark underworld is Pluto. In Roman mythology, Pluto is the god of the underworld, equivalent to the Greek god Hades. Pluto was also the name of the ninth planet in our solar system until it was reclassified as a dwarf planet in 2006.