Even if astronauts could sustain themselves indefinitely while on a trip to more distant plants it'd he a huge sacrifice because of the time it takes. Whoever would decide to go would probably not see their family for many decades, if ever again. To the outer planets it would practically be a suicide mission in the name of science.

Astronomy is insanely awesome but equally frustrating. Much like geology, first-hand results/data takes a very long time to harvest, and the data that can be is usually miniscule in the grand scale of things. When almost everything around you has lifetimes of billions of years and even the entire lifetime of humans themselves as a race is but a fraction of a fraction of the lifetime of even Earth... it's hard to really ever know anything.

It's exciting to see all the new stuff that science discovers, but also it's saddening to know there is a lot that I will never see happen. Most experiments involved with space take generations or more to reap the rewards. There's just too much to try to ever know over way too long of a time.