Hi Sylvain;
As Ron has indicated, Carl Sagan was probably one of the greatest scientific visionaries in this area.
There's a tv documentary series doing the rounds presently called "Visions of the Future" - the presenter is Michio Kaku.
Supernova1965 (Warren) did
another thread about this in the Books & Media Forum. The show was only fairly recent. There may be repeats floating around out there in TV land, if you're interested in more visionary material. I found this one good because it wasn't pitched so far out that it became Scifi.
Cheers & Rgds.
PS: AstroPhysicist Lawrence Krauss also wrote a book about "The Science of Star Trek" .. Brian Greene (my favourite) gets into the reality of time travel in Fabric of the Cosmos (the best book ever about the real Science part of Cosmology .. Michio Kaku's book "Parallel Worlds" is also a good fairly light read. Cheers.