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Was this after complete darkness fell, or was there still some light in the sky? Are you at a "dark sky" site, or do you suffer from some light pollution?
If you have clear dark skies, it could have been a nebula or part of the Milky Way (and if so, it will be there again tonight!), but if it was before complete darkness, and / or you have light polluted skies, it was more likelly a cloud or vapour trail.
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