Hope all you filmmakers out there enjoy my latest tutorial :) https://www.youtube.com/watch?v=w8H-KRAOGYM
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I love AE. I thought you might use blend mode and mask feather and expansion. To get those planets to "fit". To get letterbox. Wide screen as you referred to it. Get that in Render output settings. It will letterbox for you. FWIW, But your solid faked it good enough.