I was excited about the Breakthrough Starshot initiative; a project to fire a tiny probe to the next star system. It would take decades to get there, or more than a human lifetime if we want it to enter into orbit when it arrives. But, what ya gonna do, stars are wicked far apart, yo.
…However, now we have the concept of using the sun as a gravitational lens telescope (the concept isn’t new, but AIUI, the algorithms to be able to compute high-res images from the hall-of-mirrors lensing effect is new).
So we can travel only a fraction of a percent of the distance to alpha cen, and yet hypothetically image planets (plural) that are much further away.
I am aware that this is not a done deal by any means – a solar gravitational lens telescope array would require multiple huge scientific and engineering breakthroughs, and actually has a number of annoying limitations. But the same could be said of an interstellar probe.
(I thought about putting this in GD, but I’m not sure there’s much of a debate to be had)