Just a little question this time.
I guess it could be broadened to include most magneto-plasma based engines. I was watching this vid I found (I think somewhere on this forum), and I noticed the VASIMR's thruster exhausts glow a bright blue. Do any of you know if this is just to make it look cool, or would it really glow like that?
I heard that the VASIMR would use radio-waves to ionize the gases used for propulsion, and I know radiowaves are invisible to the naked eye. But the glowing might not be caused directly by the radiowaves, I'm not sure.