Make a copy of the last made layer and select the Free Transform option to place the copy as it is done on the next picture:

Try to divide horizontally in your mind the big planet in two parts and select after that the Pen Tool (P) to represent the layer of the remote horizon, colored with #3899EA

The layer’s parameters: Fill 50%

Use next the Pen Tool (P) to represent the first layer, reserved for the forest that would have the black color.

Create a new layer now and select the Brush Tool (B) out of the standard set Dry media brushes and use it on the upper forest’s edge.
The Opacity is 23% and the color is black.
Apply for the layer also the next selection: Filter>Blur>Blur

Make a copy of the last made layer and change the color on white. Use the Free Transform selection to lift a little the copied layer. Next use the same brush, but this time of white color to make several patches along the upper layer’s edge. Place this layer lower than the previous one on the layers’ panel.

The layer’s parameters: Blending mode-Soft light

Combine in a group all the layers composing the black forest’s silhouette (press on Ctrl button to mark out the necessary layer and keep the left mouse’s button pressed when taking down the marked layers on Create a new group option).
Make a copy now of the last made group and select the Free Transform option to turn it over and place it the way it is shown on the picture. Move off the copied group the brush’s layer of white color and make a copy of the first brush’s black layer. Use next the Free Transform option again to pull it down, applying for it the layer’s parameter shown here: Blending mode-Overlay

Create a new layer and use on it a standard brush to represent the primary layer reserved for the mountains’ range on the horizon. The color in this case is #0E1552
Place this layer lower than the black forest’s layers.

1. New file, goto the scroll menu and select flash, or make it 550×400

2. Press “D” to go back to default colors, fill layer with white (ctrl+Backspace)

3. Time to add a moon, goto Filter, Render, Lighting effects, and use something around these settings.

4. You need to get darker colors for you clouds, I used #898988 and #4b4b4b

5. Make a new layer, then goto Filters, Render, Clouds. (Ctrl+F if you dont like the outcome)

6.Now just goto the Hue/Saturation.
Use something around these settings:
Hue:216
Saturation:19
Lightness:+20

7. Now set the Blending Mode to Overlay

Now it should look something like this:

8.Now make a new layer, set your colors back to defalut (press “D”), and fill the layer with black, Alt+Backspace.

9. Stars now, goto Filters, Noise, Add Noise. Check Gaussian, and Monochromatic and use about 14-16.

10. Set the blending mode on the Noise layer to Soft Light and then your done.

Myn turned out:

And for added effect add another layer with a “Spotlight” Light effect, and play around with the blending mode and order of layers for a shooting star.
and with the shooting star: