I know we've been here before, but I love the name of this thing, and what it will no doubt be contracted to eventually: Impulse engines. Who cares if it works, just as long as it has a cool name straight out of Sci-Fi!

And it can only be a matter of time before Warp drive comes along. Although, for simplicity, maybe we should just call that FTL drive.

Don't tell me NASA is actually doing original research and not waiting for hand-me-downs from the Russians!! Quick, somebody tell Congress!!

Recently been reading 2010 and 2063, so plasma drives are currently top of my list of awesome stuff. The Mars-in-39-days quote sounds amazing - let's just hope that's a realistic estimate and not just overly optimistic.

Reach Mars in 39 days. Is this after all the damage from hitting random debris on the way or before?

"So I would not be so sure if NASA is really putting an engine on it or some defensive armament."

This is probably a joke but no joke is so crazy that someone won't take it seriously, so I'd like to write about this for a sec.

A VASIMR puts out a minute amount of power. The gas is very hot, and may in fact burn your face if unshielded, but it will do absolutely nothing to another machine, especially not a spaceship. Not one of our spaceships, not an alien spaceship, nothing.

A bog standard 12mm turret gun like from a helicopter would do a lot more and could probably depressurize a Soyuz or Space Shuttle, or ruin a space shuttle's ability to land.

It would work in space, it would not deliver enough kinetic energy to alter the station's orbit and the station's attitude control system could easily deal with the torque from firing a few bullets.

Modern bullets also carry their own oxidizer. Everything they need to go bang is right there in the shell and will work happily in a vacuum.

So physics are perfectly happy with guns in space, and they'll pack far more punch than the 200 kilowatt VASMIR.

All that said, you wouldn't bother putting a gun OR a VASIMR on the station as a weapon anyway.

The only enemy the station could possibly have is China; the station will be deorbited before Iran's space program is far enough along to perform space combat.

And the way China (and the States) smack sats is with surface launched space torpedos.

They come in so bloody fast, with mindblowing closing speed of several kilometers per second, that no gun or plasma engine could ever hope to deflect them.

"The Mars-in-39-days quote sounds amazing - let's just hope that's a realistic estimate and not just overly optimistic."

It's realistic in theory.

It assumes a lot of development on VASIMR has been done, though, and the power processing abilities are in the megawatt range.

It also assumes we have space-rated nuclear reactors, really powerful ones.

Both are plausible. But it's not just around the corner.

If Obama doesn't kill the Moon base, they'll have a ton of work to do short term to push their development.

A reusable VASIMR based solar-electric tug could replace massive upper stages for perform the "translunar injection burn".

This could far more than double the amount of mass any given rocket could ship to the Moon, even the epic monster rocket Ares V.

You could refuel the thing with fuel pods launched dirt ship widow maker rockets.

So this is very exciting to see it's going to be flown and tested on the ISS.

spaceship with a battery-powered main drive. Shouldn't this be under "'leccy tech" rather than "space"?

One step closer to build TIE fighter. Bring it on, I'm looking forward to our own clone troops.

Does anyone know what batteries it is running? 200Kw for up to 10 minutes seems rather a lot, and by my excellent mathematics (cough) requires 192 average-sized car batteries. Heavy stuff...

Tim#3

Is the 39 days to reach Mars an estimate based on traveling the distance and going splat into the side of the planet, like recent probes, or is it taking into account the tedious deceleration required to approach at non-suicidal speeds? I'm sure the Martians are getting a bit cheesed off at the amount of crap we keep littering their planet with.

The article seems to imply that this is a new technology. While the specific engine in question is new, the ion drive technology was in operation 10 years ago aboard Deep Space 1. The old engine was referred to as NSTAR and was reportedly developed at a NASA research facility. Perhaps Ad Astra and the VASIMR engine are descendants or spinoffs of that project?

Zombies in space?

Seriously though, is that 39-day figure valid when Mars is on the other side of the sun? Somehow I imagine he's referencing the best case scenario, when Mars is closest to the Earth.

Non-space boffins will want a shorter, more descriptive name for what to call the new space engines when they're used in more probes and such. As D. M and AC #1 mentioned, we'll probably end up with either ion or impulse engines... finally settling the Star Wars/Trek debate.

Regarding Greg Trocchia's comment: If it isn't obvious, adding more fuel also adds more mass to your rocket/spaceship/whatever, but doesn't increase thrust. The engine burns longer, but produces less acceleration, limiting the improvement in delta V. This is why Isaac Asimov was pessimistic about interstellar travel being anything other than a very slow, one-way endeavor. The amount of conventional fuel required to get up to a significant fraction of the speed of light (0.1c would take 'only' ~40 years to reach Alpha Centauri), and then slow down at your destination, is simply infeasible. With plasma drives powered by nuclear reactors, we might actually be able to reach the stars.

Of course, even better would be a space drive that doesn't need reaction mass at all. Maybe there's some way to mess around with dark energy...