Live coverage: Delta 4 countdown and launch journal

Technicians began the painstaking work of assembling a powerful Atlas 5 rocket today, a launcher that will deploy an advanced satellite to substantially improve U.S. weather forecasting.

A commercial communications satellite will blast off Thursday from French Guiana on top of a Soyuz rocket, on the way to a station over the Americas to supply bandwidth to airline travelers and broadcasters in the United States, Canada and Mexico.

SpaceX successfully launched an oft-delayed Falcon 9 rocket mission at 6:35 p.m. EST (2335 GMT) Friday after more than a week of delays caused by issues with super-chilled liquid oxygen propellant, a boat the strayed into restricted waters offshore Cape Canaveral, and extreme upper level winds. The experimental recovery of the first stage on an ocean-going barge was not a success.