Start with a grey background something like this, try and make the canvas as square as possible
	Using a small round brush, draw a small circle, make a selection around it like this and goto Edit/define pattern
	Deselect then goto Edit/fill the choose the pattern you have just made, fill it then make a circle selection
	Apply the distort/spherize filter at 100%
	Goto lighting effects and apply a soft omni at default settings like this, tick the red texture channel to give it the lumpy texture
	Invert your selection and cut away the waste with black as your background colour, i shrunk it down a touch using edit/transform/scale before going to the next step
	Duplicate that layer, apply a lensflare in the top left corner of the sphere then radial blur it by 20
	Just set your blending option to color dodge 100% for that layer and you're done

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