Water-Powered Spaceship Could Make Spaceflight Cheaper | Space Travel and Exploration | Spaceship Concepts | Space.com: "Spaceships powered primarily by water could open up the solar system to exploration, making flights to Mars and other far-flung locales far cheaper, a recent study has found.
A journey to Mars and back in a water-fueled vehicle could cost as little as one space shuttle launch costs today, researchers said. And the idea is to keep these 'space coaches' in orbit between trips, so their relative value would grow over time, as the vehicles reduce the need for expensive one-off missions that launch from Earth.
The water-powered space coach is just a concept at the moment, but it could become a reality soon enough, researchers said."
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