If someone were to fire a gun in space, would the bullet travel normally?
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There are no straight lines in space, gravity is everywhere.
Depending on where it is fired, it will travel at a near constant velocity (very very extremely small drag due to the occasional particle it hits) in an orbit around the most massive nearby celestial object (unless the muzzle velocity is greater than the escape velocity of that particular object, and it ends up orbiting something much more massive but further away eg. galactic core). The eccentricity of the orbit is determined by the direction it is fired and the velocity vector of the shooter relative to the same celestial object. Unless the trajectory intersects a planet or star or other object, it will orbit for a very long time.
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