Create a new document with a size of 150x120 px, 300 dpi, background: white. The size is basicly enough but if u decided to try the next steps on the larger size of a document u will have to incerase the other sizes step by step.
Gradient Tool
Adjust the color of the first plan to be black and for the background color put R:0 G:80 B:125. Now, with the help of a Gradient tool do the overlayer, starting form a vertex, hold the left mouse together with the button Shift and let it loose by the end of the layer.
Brush Tool
Create a new layer and name it: ball. Take a Brush Tool and for the kind for a brush choose Soft Round of 60 pixels. Now, change the color of the first plan to be white (button D and then button X). Click with the left mouse a liitle over the middle of the workspace layer.
Next step is to add the glows to the layer: Ball. In the panoe Layers click two times with the left mouse, on the right side form the name of the layer wich is: ball or just go to Layer> Layer style >Blending Options. Mark the Outer glow, the basic markings should be like on the picture, the only thing left is to change the parameters for the color R:147 G:223 B:255. After this, click Ok.
Now we are going to make the reflection of the ball with the help of the mask. Duplicate the ball with the right click of the mouse on the panoe layers on the layer: ball and then with the left mouse click on the Duplicate Layers . Click Ok. Go to Edit> Transform> Scale. Do the transformation by taking the upper side with the left mouse and pulling it down all the way until the new layer is around 50% under the layer :ball (just like on the picture). Click the button Enter. After this change it for 5 pixels downward (5 times click on the arrow down).
Mask Tool
Stay on the new layer where u now need to put mask. This you will do by going to Add Layer Mask (down: the second option on the left side). Choose Gradient tool, the color of the first plan is white and the background is black (button D) and then start to pull form the bottom edge of the new layer to 80% of its' size, a litte under the vertex.