Venus

Venus (or Sol II) was the second planet from Sol. Venus was the origin of Venusian aikido and a Venusian lullaby, presumably both created by the native Venusian race.

Venusian spearmint also grew on the planet, and is used as a toothpaste flavouring. (DW: The Shakespeare Code)

Venus was also the final obstacle on a race course set up by the Eternals. (DW: Enlightenment)

In the year 200,000, sandstorms on a planet known as New Venus kill 200 sentients in the Archipelago. (DW: The Long Game)