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<p>the <a href="page.php?w=telecommunications">telecommunications</a> subsystem include radio antennas, transmitters and receivers. These may be used to communicate with ground stations on Earth, or with other spacecraft.</p>

<p><big> Electrical power </big></p>
<p>The supply of electric power on spacecraft generally come from <a href="page.php?w=photovoltaic">photovoltaic</a> (solar) cells or from a <a href="page.php?w=radioisotope_thermoelectric_generator">radioisotope thermoelectric generator</a>. Other components of the subsystem include batteries for</p><p>
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