Live coverage: Proton fires into space with Eutelsat 9B

The launch of a Boeing-built Mexican communications satellite on a Proton rocket has been postponed after engineers discovered an anomaly on a similar spacecraft.

Extra testing of the James Webb Space Telescope and delays in assembling the powerful observatory will push back the $10 billion mission’s launch by at least six months to early 2019, officials announced last week as the telescope successfully completed an extensive performance test inside a cryogenic vacuum chamber in Houston.

Follow the key events of the Falcon 9 rocket’s ascent to orbit with the fifth set of 10 next-generation satellites for Iridium’s voice and data relay fleet.