You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser.
I have a question for all the space enthusiasts around here.
What sort of advanced propulsion system that is not a NERVA style nuclear engine or a simple ion thruster could possibly developed during the 1990s?
Something akin to the VASMIR? A Fission Fragment Engine?
What would be realistic?