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In Rogue One, after the words A long time ago in a galaxy far, far away.... appear on the screen, it immediately cuts to a shot of mostly empty space. I say mostly because there are some weird lines in the top right corner. I can't seem to find a screenshot, so I drew it from memory after seeing the film twice in theaters.
What are those lines? We eventually see Krennic's shuttle fly by in the next shot and those lines are gone:
Those were the rings of Lah'mu, the planet on which Galen Erso was hiding.
Star Wars: Rogue One: The Ultimate Visual Guide
This image from the film gives you a better view. As you can see, the rings themselves are partially shadowed, explaining their abrupt edges.
