“We already have the means to travel among the stars, but these technologies are locked up in black projects and it would take an act of GOD to ever get them out to benefit humanity”
There is a video of him giving a speech where he says this as he is walking off the stage. I can no longer find that video.
Yep. And for thermal rockets, radioisotopes like Pu238 could be the ticket at temperatures of 1000 C and can supply usable temperatures for its half-life of almost 88 years.