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View all search resultsLaunched in 1977 to explore the outer planets and serve as a beacon of humanity to the wider universe, it is currently more than 12.3 billion miles (19.9 billion kilometers) from our planet, well beyond the solar system.
A private Chinese company launched into orbit on Wednesday the world's first methane-liquid oxygen rocket, beating US rivals SpaceX and Blue Origin in sending what could become the next generation of launch vehicles into space.
Einstein's theory of relativity predicts that because space is expanding, "we should see the distant universe run in slow motion," said Geraint Lewis, an astrophysicist at the University of Sydney and the lead author of a new study.