Reaching the Stars

There are no known proposals for interstellar travel yet. But, a plan has been proposed in 2017 for a fly-by of the nearest star, which has a potentially inhabitable planet circling around it. This plan received $100M seed funding, and none of its elements are impossible. Specific solutions have not been proposed to some of the tactical details.

https://www.scientificamerican.com/article/what-it-would-take-to-reach-the-stars/

Also, Webb Space Telescope (next step after Hubbel) launched in 2021 at a $10B budget (10x overbudget).