Or in a different universe (if we live in a multiverse) where physical laws could be different?
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If it is flat, would it actually be a planet? [quote][i]A planet is an astronomical body orbiting a star or stellar remnant [b]that is massive enough to be [u]rounded by its own gravity[/u][/b], is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals.[/i][/quote] So, no.