Dr. Pekka Janhunen is a researcher with the Finnish Meteorological Institute and the inventor of the Electric Solar Wind Sail concept, using the solar wind as a propulsion system for spacecraft.
These could allow spacecraft to explore many regions of the Solar System without any onboard propellant at all.
More information about Dr. Janhunen:
https://space.fmi.fi/~pjanhune/
Learn more about the concept in this video:
https://www.youtube.com/watch?v=-pIl_cv3OkA
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