[a_square_peg]

No, that's silly. That'd be like saying we won't know whether time-travel is possible without trying or won't know if drinking urine can cure Covid without trying. A feasible project is something that has a plausible path to finish line based on existing body of knowledge without breaking basic laws of physics or economics.

[philipswood]

Checkout [Tipler Cylinder](https://en.m.wikipedia.org/wiki/Tipler_cylinder).

I'd say it allows you to say "we won't know if time travel is possible without trying" with a reasonably straight face...

[pawelmurias]

It sometimes makes sense to embark on a project without a clear path to the end as a way to discover how you should proceed yet.