In addition, the cost is significantly lower if you do flybys from one planet to get to the next, so it's questionable whether it's worth frequently sending separate orbiters to Uranus and Neptune rather than generally sending joint missions that fly by Uranus a few times before heading to Neptune.
How can something doing a flyby of Uranus on its way to Neptune get more than one pass at Uranus?
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How can something doing a flyby of Uranus on its way to Neptune get more than one pass at Uranus?