Live coverage: Cygnus supply ship arrives at space station

Follow the major events of the Atlas 5 rocket’s launch with the Solar Orbiter spacecraft with this mission timeline.

After a bit of a struggle with a balky bolt, space station commander Peggy Whitson replaced a failed external computer during a short, hurriedly planned spacewalk Tuesday while crewmate Jack Fischer installed a pair of antennas to improve wireless communications during future excursions.

Two months after its foggy blastoff from California on a Falcon 9 rocket, a $364 million oceanography satellite has returned the first data from its radar altimeter mapping global sea levels, catching this year’s ongoing El Niño in the act.