Gaia: launch postponed

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Due to recently discovered technical issues with a separate satellite, ESA has decided to perform additional precautionary verifications on its Gaia satellite. Therefore we have requested that Arianespace postpone the Gaia launch, currently scheduled for 20 November.

More details will be given as soon as they are available and the new launch date will be announced when the timeline for completing the additional work has been confirmed.

via ESA Space Science

http://www.esa.int/Our_Activities/Space_Science/Gaia/Gaia_launch_postponed