hairo Sun aga earth hamen Moon ceiro star panyunadi Universe
as for those planets named after Roman deities, I'd suggest:
akijo Mercury abuzanjo Venus (or abujozan?) also: kiriceiro and niriceiro bajo Mars jopara Jupiter rijo Saturn hujo Uranus sujo Neptune
I think a better solution would be saying "planet" turning it into an adjective with "-o" and then putting the Scientific International Names for the planets (Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto).
Sol (hairo) Luna (hamen) Merkuri Venus Mars Jupiter Saturn Uranus Neptun Pluto
If you use "hairo", "hamen", and "aga" then you don't have to put "planet [adjective]" in front of the word. This is only for borrowed planet names so that people will not confuse these foreign names with Sona radicals.