It is a 60% chance that mars used to have life (not human life)
however,it is 100% true that mars used to have as much water as earth had.
btw,venus is actually hotter than mercury.
venus has an atmosphere that prevents heat from escaping the planet.
and,neptune is colder than pluto because plutos core is made up of rock,while neptunes is made up of ice.
also because when pluto is the nearest it can be to the sun in its orbit,pluto is closer to the sun than neptune is.
Another fact,when jupiters core becomes very dense,it`s tempature reaches a maximum of 55,000 celsius.hotter than the suns surface!
Another thing about jupiter is that u cant land on it so u have to reach the core and if u land on the core and jump,the intese gravity will crush u to a pulp:p