How a steam-powered robot could explore Enceladus

The thing designated SPARROW that engineers from NASA’s Jet Propulsion Laboratory want to send to the icy moons of Enceladus and Europa has nothing at all in common with its namesake bird. Americans and scientists love acronyms, and the designation SPARROW came from the name “Steam Propelled Autonomous Retrieval Robot for Ocean Worlds.” The project is part of the “NASA Innovative Advanced Concepts” program (NIAC), whose current candidates were announced by NASA earlier in Spring 2020.

SPARROW stands out because it uses a very old propulsion solution from the start of the Industrial Age. But instead of coal for steam locomotives, it uses steam for a rocket propellant. To do this, SPARROW heats and melts the abundantly plentiful ice. With short bursts of steam, the approximately soccer ball-sized robot can then make large hops in the low gravity of the icy moons. The concept involves a lander base unit releasing and coordinating several SPARROWs.

Here is a video that the engineers made to illustrate their proposal:

Several SPARROWs exploring an area together (image: NASA/JPL-Caltech)
A SPARROW launches from its base unit (illustration: NASA/JPL-Caltech), artist’s depiction

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  • BrandonQMorris
  • Brandon Q. Morris is a physicist and space specialist. He has long been concerned with space issues, both professionally and privately and while he wanted to become an astronaut, he had to stay on Earth for a variety of reasons. He is particularly fascinated by the “what if” and through his books he aims to share compelling hard science fiction stories that could actually happen, and someday may happen. Morris is the author of several best-selling science fiction novels, including The Enceladus Series.

    Brandon is a proud member of the Science Fiction and Fantasy Writers of America and of the Mars Society.