How to Propel Tiny Satellites? Just Add Ice

Ice is a pretty all-around useful chemical, but generally for mundane things: chilling drinks, skating on, mending swollen joints. But some scientists have a far sexier purpose in mind for ice — as rocket fuel.

CubeSats, introduced in the early 2000s, are music-box-sized satellites that are democratizing space research because they are tiny, inexpensive and can perform myriad tasks. For all their versatility, CubeSats have a glaring flaw: Engineers are hard-pressed to fit a propulsion sys

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