This list is HIGHLYnon-exhaustive, and covers only worlds which the average spacefarer will know of.
THERE ARE DOZENS, PERHAPS HUNDREDS MORE.
The homeworld of the Terran people. A diverse world, it is sometimes inhospitable to other sapients, due to having experienced a thermonuclear apocalypse three hundred years ago. Known today as a temperate and cool world, thanks to a terraforming process completed about 50 years ago.
Nobody's quite sure if the Terrans are serious when they say Mars used to be red. The capital of the Space Commune, it is today a highly diplomatic world, despite being rural. Mars is cold, and certain quirks of it's orbit mean the terraformation process created a highly unique ecosystem.