I wonder what hope we have for making probes that will last longer (i.e., “do science even deeper in space”) than Voyager 1, Voyager 2, and New Horizons. Specifically, whether we can make RTGs or other power sources that last longer and/or scientific instruments that operate with lower power (without compromising on quality or quantity of observations). Maybe there just isn’t much science to do beyond the Kuiper Belt (or rather, getting 50 years beyond the Kuiper Belt doesn’t improve science much more than making the same observations from the KB itself due to the vastness of space)?