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Originally Posted by Anonymous what power or fuel do they use to travel in space?
"In 1997, Pioneer 10 was about 6,000 million miles (nearly 10 billion km) from Earth. It left the solar system in 1986. Eventually it will be overtaken by Voyager 1, which is travelling faster. Both probes will take tens of thousands of years to reach other stars."
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I believe that at this point both Pioneer 10 and Voyager 1 are powered solely by inertia, which means they have no onboard power source. My guess is that they both used solid fuel propulsion to escape Earth's gravity, but that is only a guess. Perhaps Red knows for sure.
:)
[Edited for spelling.]
:)