I made a very little system of 2 planet, one of them as water on it, but it get an hot 30 C° on summer but his temperature can go down to -45 C° on winter !
The other planet is a gas giant with a radius of about 170000 km !
This planet is 2 times as big as Jupiter but it only have 2 moons (for now
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This one seem to have an old river trace, maybe there was a time where this planet had water...
EDIT : Here the planets in chart mode to show off their sizes, I've added the Earth, the moon, and Jupiter to give an idea of the sizes :
PS: Can someone show me how to add an image attachment ? My image hoster reduces the images quality.