On the current edition of Dr. David Livingston’s The Space Show, Dr. Michio Kaku and Dr. Bob Krone are interviewed.
It’s a wide-ranging interview, with many topics discussed, among them:
“As for discussing space travel, Dr. Kaku pointed out the problem of the high cost of space access. He was asked if we needed breakthrough advanced propulsion to give us low cost space access, could we do it through the space elevator which he talks about in his book, or could space tourism or space solar power be an economic driver leading to a significantly higher launch rate which would enable commercially attractive launch prices.”
It’s a very interesting interview and can be accessed here. Note that this is an .mp3 file and must be downloaded to be played. It’s > 50MB, so… patience is a virtue 🙂