The top one is my final copy.
I used the image with the stars as the background.
I used Curves tool and Hue/Saturation tool to darken the image and used Gradient tool to change the color.
Then, I used the badlands as the landscape, which is located on the bottom of the final copy.
It was the hardest part. I opened it and used the Pen tool with the Paths, trace around the landscape.
Then I chose Make selection, but it did not work.
So I just used other marquee tool and lasso tool to make round rocky shape.
Then, I added clouds above the rocky landscape.
I learned new adjustment tool, Levels. I set the eyedropper icon and lighten up the bright areas
and darken up the dark areas.
Also, I learned new tools, Select>Color Range tool. This tool was so good.
I selected Color Range tool and selected Eyedropper tool. As I clicked on the blue area and changed
the Fuziness options, I can selected only the clouds, not the blue areas.
It took a little time to delete the blue sky areas, but I learned how to use it, finally.
Then I created the planet. I used Gaussian blur tool to give the stripes.
I learned Distort>Spherize tool. This tool make the planet really round.
I added many layer styles on my planet.
I learned Render> Lens Flare tool. It was very easy tool. I positioned the lens flare at the edge of the planet.
Finally, I added the text.
I added subtitles then I found Window> Snap. But I could not find it.
I just put the texts middle of the layer.
I learned more about Load selection when I used circle and mask out the texts.
I liked this poster!