Live coverage: H-2A rocket delivers on 30th flight

The James Webb Space Telescope should start returning its first scientific results by the end of 2019, and scientists recently announced a slate of observations selected to whet the appetites of astronomers who will use the multibillion-dollar facility well into the 2020s.

Astra was gearing up for the first orbital test flight of its small satellite launcher, named Rocket 3.0, from Alaska on Monday, but officials scrubbed the launch after detecting a problem with a guidance, navigation and control system in the final minute of the countdown. Poor weather at the launch site also prevented liftoff over the weekend on the first of two missions under the auspices of DARPA’s Launch Challenge.

SpaceX launched the first of the company’s upgraded generation of Falcon 9 launchers, known as Block 5, from the Kennedy Space Center on Friday at 4:14 p.m. EDT (2014 GMT). The Falcon 9 rocket lifted off with Bangladesh’s first communications satellite, and SpaceX recovered the rocket’s first stage on a vessel in the Atlantic Ocean.