One way you can do it is make another sphere that is just a bit bigger than the oringinal and add a cloud texture it then play with the transparentsy and cloud shape.
I'm sure once Rage or mike sees this they will have other ways about doing it at well.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb