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Nature 434, 551 (31 March 2005) | doi:10.1038/434551a; Published online 30 March 2005
Space agencies mull over mutual mission to Europa
Tony Reichhardt
A future probe to Jupiter's moon Europa and a space-based X-ray observatory should be built as joint ventures between NASA and the European Space Agency (ESA) over the next decade, researchers and agency officials say. But both agencies will find it a challenge to amass cash for the projects, which will each cost between US$1 billion and $2 billion.
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