There are a few things you need to do in order to make a nebula in Photoshop. First, create a new layer on your canvas. Then, use the following commands to create the basic shape of your nebula: • Command-click on the top left corner of your nebula and then drag it towards the bottom right corner. This will create a triangle shape. • Command-click on one of the sides of your triangle and then drag it towards the center of your nebula. This will create a more complex shape. • Finally, use the following commands to change the color of your nebula: • Command-click on one of the colors in your palette and then drag it towards the center of your nebula. This will change its color to that specific color.