Select both of these layers in the layers panel, and move them to the right using the Move Tool (Shortcut: V). Remember to hold Shift while dragging them, and make sure to drag these layers until their left side matches the left border of our scene.

And here is the result (press the Spacebar to view it):

To finish this step, we’re going to animate the glow of the stars. Open the animation panel of our Stars Glow layer, and click in the stopwatch of the Opacity (make sure that the blue arrow is at the beginning of our timeline).

Now drag the blue arrow to 01:00f and lower the opacity of the Stars Glow layer to 0%.

Now select both of the keyframes we just created (click anywhere with the left mouse button and drag a box around them), right click in one of them, and click in Copy Keyframes.

Drag your blue arrow to 02:00f, right click one of the keyframes, and select Paste Keyframes.

And here’s the result:

Repeat these steps three more times, setting the blue arrow at 04:00f, 06:00f and 08:00f, and pasting the two keyframes we copied before in each one of these times (you don’t have to copy again). When you’re done, set the blue arrow at 10:00f and raise the opacity of the Stars Glow layer to 100% again. Here’s how your animation panel should look like now:

And this is the final result, with the glow of the stars fading and reappearing every 2 minutes:

Step 10:Adding some meteors

If you changed the brushes we added before, go ahead and load the Galaxies_bySunira again. Select the Sideview Spiral Galaxy brush.

Create a new layer (Shortcut: Ctrl/Cmd+Alt/Opt+Shift+N) and name it Meteors. Place it right below the Trees layer.

Before creating the meteor, go to Window > Brush and change the angle of the brush to 75º.

Now lower the size of the brush to around 20~30px and paint three meteors with different sizes on the top of the screen.  I used 30px/25px/20px for the size of the meteors.

Double click the Meteors layer and add an Outer Glow layer style.

Here is the result:

Using the Move Tool (Shortcut: V), drag the meteors out of the screen while holding the shift key. Drag them in the direction of the arrow below: