This does not mean we totally ignore the rest of the Universe. The odds are reasonable that there are advanced intelligent civilizations out there, and chances are they are sending us messages. As detection is one percent of sending people into space, an advanced SETI enterprise would make a lot of sense
So what is the next frontier? Well, our present nuclear technology features fission, the equivalent of an Atomic Bomb using uranium/plutonium. The thought of a Thorium-powered car I find intriguing, for eight grams can run a vehicle for 100 years. I've had discussions with Kirk Sorenson.
Fusion energy (the equivalent of a Hydrogen Bomb) for controlled power will someday happen on Planet Earth. If our Sun and all the stars use this process to produce energy, surely, that must be an obvious clue for us. So also in the 70's, off I went to work for the Lawrence Livermore National Laboratory on laser fusion.
Just about three decades ago I hired Bor Yann Liaw to work on this potential in Hawaii. Well, nothing much came of this option, but in my heart, I still think there is something here.
In the mid-90's I was part of a group in the Renaissance Project to advance cold fusion as the replacement for batteries. This is where a thinking billionaire might want to build a legacy.