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X-ray Observatories
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Which X-ray observatory was launched by the European Space Agency (ESA) in 1999?
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A
XMM-Newton
💡 Explanation:
XMM-Newton is a European Space Agency (ESA) X-ray observatory launched in 1999. It is designed to study high-energy phenomena in the universe, such as black holes, neutron stars, and supernovae.