Live coverage: Delta 2 launches

After an exhaustive investigation, SpaceX engineers have identified the most likely cause of the spectacular explosion of a Falcon 9 rocket during a pre-launch test Sept. 1 that destroyed the booster and its $195 million satellite payload, the company announced Monday.

A Vega rocket has blasted off with Europe’s LISA Pathfinder tech demo mission, a probe heading to a station a million miles from Earth to test systems for a future gravitational wave observatory. Liftoff from French Guiana occurred at 0404 GMT Thursday (11:04 p.m. EST Wednesday).

Meteorologists predict mostly sunny skies, mild temperatures and light winds Sunday for the launch of a SpaceX Falcon 9 rocket from California’s Central Coast with a $364 million oceanography satellite for U.S. and European science institutions.