Interplanetary space probe Ulysses officially ceased operations on Tuesday after an 18-year voyage of roughly 5.5 billion miles (8.85 billion km) and nearly three complete orbits around the sun, NASA said.
By staying active for the better part of two 11-year solar cycles, Ulysses collected a wealth of information that formed the basis of over 1,000 scientific articles and two books.
Among its discoveries was a finding that the solar wind, a steady stream of charged sub-atomic particles blown out from the sun at about 1 million mph (1.6 million kph), has dwindled to its lowest level in at least 50 years.
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