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Momentus reports successful use of its new water-based thrusters on its orbiting Vigoride-5 tug

The orbital tug startup Momentus on March 23, 2023 reported the successful use of its new water-based thrusters on its orbiting Vigoride-5 prototype tug, proving the design works.

The Reaction Control System operates using the same propellant and tank with water as the Vigoride spacecraft’s primary MET propulsion system. The MET is designed to use water as a propellant and produce thrust by expelling extremely hot gases through a rocket nozzle. Unlike a conventional chemical rocket engine, which creates thrust through a chemical reaction, the MET is designed to create a plasma and thrust using microwave energy. When operational, the MET will be used to raise the orbital altitude and inclination of Vigoride-5.

Essentially this is a variation of an ion engine. The thrust will be low, but very efficient. The thrusters can therefore fire for a very long time, building up accelerations infeasible for chemical engines, and thus allowing the tug to significantly change the orbits of satellites in ways that was previously impossible.

This release came out the day before NASDAQ announced that Momentus has six months to raise the price of its stock above one dollar or be delisted from the stock exchange. Since its release, the stock price rose from $0.54 to $0.63, still below a dollar but going in the right direction, despite the NASDAQ announcement.

Conscious Choice cover

Now available in hardback and paperback as well as ebook!


From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.


“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.


All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. All editions can also be purchased direct from the ebook publisher, ebookit, in which case you don't support the big tech companies and the author gets a bigger cut much sooner.


Autographed printed copies are also available at discount directly from me (hardback $24.95; paperback $14.95; Shipping cost for either: $5.00). Just email me at zimmerman @ nasw dot org.


  • Going to be ‘that guy’:

    ” . . . in ways that was [were] previously impossible.

  • Couldn’t one call this a steam engine?

  • Steve Richter

    Just to be annoying, water is very important to the planet and the Earth has been recycling all it has since the being of time. Sending water into orbit and then using it as propellant means it is lost to the Earth for ever.

  • Concerned

    Steve Richter– there are literally megatons of water vapor in the atmosphere, going up to high altitudes. Are you sure all of that has been eternally retained and not lost to space or other dissociation processes? I’d be willing to bet we lose tons of H2O per day due to solar radiation, solar wind, and other natural processes. We may also gain a good amount daily from meteorites.
    You’re right: Mankind bad for Earth is annoying.

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