The forecast of stormy weather prevented rollback of the mobile service gantry and the continuation of the countdown at Cape Canaveral on Wednesday for the United Launch Alliance Delta 4 rocket.

United Launch Alliance’s rocket transport ship has delivered a Delta 4-Heavy rocket to Vandenberg Air Force Base in California in preparation for launch of a U.S. government spy satellite late this year.

A NASA spacecraft being readied for launch in 2018 will make repeated trips through the sun’s outer atmosphere, passing within 4 million miles of the star’s blazing surface at more than 430,000 mph to shed light on what powers the sun’s high-temperature corona, the origins of the solar wind and the causes of potentially catastrophic solar storms.