Then I'm going to hold down my Shift key to constrain my selection to a perfect circle and I'm going to hold down my Alt (Win) / Option (Mac) key to tell Photoshop to use the point I'm about to click on as the center of my selection, so the selection extends out in all directions from that point. With my Elliptical Marquee Tool selected, I'm going to position my mouse as close to the center of the planet as possible to start with. Step 2: Drag A Selection Around The Object, A Bit Larger Than The Object Itself Select the Elliptical Marquee Tool from the Tools palette.
