Jono wrote:
simon_says wrote:
VASIMR is a private project run by a private corporation. NASA is going to let them test a thruster on the ISS. The near term use is for thrusters, not Mars engines. To do more would require a revolutionary space power source, which is not funded.
Find a significant budget for VASIMR at NASA. Good luck. it's not there. This is just more Zubrin Mars Now advocacy. He can't deal with the fact that we won't be going in his lifetime. Then conservatives who hate Obama twist this into a major Obama space initiative (it's not), as they did with Bolden's talk of outreach to Muslim nations. This is just low brow online political blah blah.
If you had actually watched the first video, you'd know Zubrin's point is that developing the technology for VASIMR is waste of money to begin with. The VASIMR design has already been around for 30 years and prototypes have already been tested in the lab and needless to say that other, already existing, electric propulsion systems are already more efficient than VASIMR.
Has nothing to do with the OPs point. This is not an Obama initiative. It's a private company run by a former astronaut who has been doing this work for decades and who may in future fly a small prototype to the ISS. There are advantages and disadvantages to different thrusters and Zubrin is entitled to his opinion. But private thrusters arent his concern, his concern is Mars now! (as always). And the agreement to test it was signed under Bush, not Obama.
The OP is trying to insinuate that VASIMR is a feature or focus of the current exploration program. That is not the case. It may be a far future feature but that's notional stuff, not something that is budgeted as an exploration option. No current NASA reference plans incorporate VASIMR for exploration. That's a fact.
Zubrin is reacting to a comment by the NASA administrator, not the actual budget or policy. But budget is policy. Anything else is just talking and dreaming of what might happen one day.