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Its sophisticated gradiometer - the instrument used to make gravity measurements - incorporated composite materials which were expected to ride out the destructive forces that would ordinarily incinerate traditional components.

Its sophisticated gradiometer - the instrument used to make gravity measurements - incorporated composite materials that were expected to ride out the destructive forces that would ordinarily incinerate traditional components.

Its super-sensitive gradiometer was used to detect the tiny variations in the pull of gravity across the surface of the Earth.

Goce, for example, made use of a carbon-carbon structure in its gradiometer.

Parts of the gradiometer instrument will survive to the surface It is simply not possible at this stage to say precisely when or where the debris fall will occur.