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Voyager 1 and 2 benefitted greatly from a one-of-a-kind planet alignment allowing for a gravitational assist.

But the next windows is? Or anyone calculating?

Actually new horizon seems not largely dependent on this to say the least. Not that it would not help. Seem not used.

On top of older pioneer 10 and 11, we do have https://en.m.wikipedia.org/wiki/New_Horizons

Cost

Tools that take scientific measurements are the same as they were 30 years ago at broadcasting from that distance, maybe more reliable but same overall outputs

Current voyagers already give that information

Unless we master microwave tech, we can't make the Voyagers travel out faster

But you do not look at something 2 times. And the technology must have been improved over the decades. Come on. Why not?

the tech has improved in every sphere of space research, but from that distance we are limited by speed of light/radio waves and speed of the craft still. i.e nothing new to gain for us.

Am I read incorrectly but new horizon is a bit too “cheap” at < 1 billion us$. Not my money of course. Still not excessive.

Voyager 3 and 4?