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The hope is Spektr-RG can provide fresh insights on the accelerating behaviour of cosmic expansion.
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Spektr-RG is expecting to detect perhaps three million super-massive black holes during its service life.
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Spektr-RG is constructed as a two-in-one telescope.
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Plan to illuminate clusters of galaxies Spektr-RG's insights will come from mapping the distribution of hot, X-ray-emitting gas.
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Spektr-RG has taken decades to develop.
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The pair connected two cables to the airtight seal on the damaged Spektr module but were having trouble with the third.
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A key goal of Spektr-RG will be to investigate the mysterious cosmic components referred to as "dark matter" and "dark energy".