Phoenix Mars Lander spreads it solar power wings
“Power is generated using two gallium arsenide solar array wings (total area 3.1 m2) mounted to the cruise stage during cruise and via two gallium arsenide solar array wings (total area 2.9 m2) deployed from the lander after touchdown on the Martian surface. NiH2 16 amp-hour common pressure vessel batteries provide power during low solar insolation periods and during peak power operations.”
Solar Power is wireless power, without solar photovoltaic technology this mission to mars would not be possible.
For more info: http://mpfwww.jpl.nasa.gov/msp98/