Live coverage of the countdown and launch of a SpaceX Falcon 9 rocket from Space Launch Complex 4-East at Vandenberg Air Force Base, California. The mission will launch the Sentinel-6 Michael Freilich oceanography satellite for NASA, the European Space Agency, the European Commission, Eumetsat, and NOAA. Text updates will appear automatically below. Follow us on Twitter.
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ExoMars orbiter fine-tunes path toward red planet
A European spacecraft cruising toward Mars fired its main engine Thursday, tweaking its trajectory and helping set up for carefully-choreographed simultaneous maneuvers Oct. 19 to place part of the tandem mission into orbit around the red planet and deposit a stationary battery-powered lander on the Martian surface.

Live coverage: Delta 4-Heavy launches from Vandenberg Air Force Base
United Launch Alliance’s Delta 4-Heavy rocket lifted off at 11:10 a.m. PST (2:10 p.m. EST; 1910 GMT) Saturday from Vandenberg Air Force Base, California, after a month-long delay to troubleshoot a hydrogen leak in one of its boosters. The heavy-lifter was on a mission to send a U.S. government spy satellite into orbit.

NASA chief: Russian cosmonauts unlikely fly on U.S. crew capsules until next year
NASA’s acting administrator said Tuesday he does not expect Russian cosmonauts to start launching to the International Space Station on U.S. commercial crew vehicles until next year. A proposed agreement with Russia to ensure the space station is always staffed with an international crew is awaiting U.S. government approval.