The National Aeronautics and Space Administration has begun a program to develop MEMS technologies that reduce the size, weight and power of its radio transceivers. Of particular concern to NASA is miniaturizing the radios for its space-constrained extra-vehicular activities (EVAs) known as "space walks." NASA proposes that industrial partners begin developing reconfigurable multiband MEMS chips that can be inserted into future frequency-agile software-defined radios. The exploration of space imposes daunting specification goals on component suppliers--demanding a combination of small size, light weight, low power, radiation immunity, vibration tolerance and extreme longevity. Luckily, those specifications read almost like a definition of microelectromechanical systems, putting MEMS in space from the earliest Shuttle launches.