Assertion: solar cell | /r/HasProperty | main power source
Facets:
value: for most earth orbiting satellites
type: TRANSITIVE-OBJECT
Source sentences:
text: By the 1960s, solar cells were (and still are) the main power source for most Earth orbiting satellites and a number of probes into the solar system, since they offered the best power-to-weight ratio.
text: Photovoltaic cells are the main component that makes up a solar panel, while solar panels are a vital component that makes up a solar system.