In the past Buttercup was knocked in the ocean after having a battle with Mojo jojo, before Planet Fuse Arrived.....
The IAU arrived at a new definition for "planet" which left Pluto out in the cold. It is now designated as a "Dwarf Planet".
Tasty Planet happened in 2006.
Planet's Edge happened in 1992.
Planet Laika happened in 1999.
Planet Pachinko happened in 2009.
Planet Stronghold happened in 2011.
Planet of Death happened in 1997.
Planet Minigolf happened in 2010.
Planet Harriers happened in 2000.
Bad Planet happened in 2005-12.
after goku miraculously escaped from the exploding namek, he arrived on planet yardrat (planet where he learned the instant transmission). then about six or five years into the future he returned and later trunks arrived to warn him about the androids.
The IAU arrived at a new definition for "planet" which left Pluto out in the cold. It is now designated as a "Dwarf Planet". also it was called a planet when is was larger but now it has become smaller scientists no longer class it as a planet