Live coverage of the countdown and launch of an Ariane 5 rocket with the Sky Muster 2 and GSAT 18 communications satellites. Text updates will appear automatically below; there is no need to reload the page. Follow us on Twitter.
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Replacements for GRACE gravity and climate satellites ready for launch
A pair of European-built, NASA-backed research satellites set for launch Tuesday from California will extend 15 years of global gravity field measurements collected by the GRACE mission before it ended last year, supplying scientists with data to help track the melting of Earth’s ice sheets and chart the impacts of floods and droughts.