Video: Liftoff of Atlas 5 with GPS 2F-10

After unusual concentrations of hydrogen around the rocket foiled a launch attempt Dec. 19, United Launch Alliance said Friday that the company’s powerful Delta 4-Heavy launcher and a U.S. government spy satellite will remain grounded in California until at least Jan. 6 as engineers troubleshoot a small fuel leak.

Take a walk around the Ariane 5 launch pad in French Guiana after the 16-story rocket arrived at the complex for liftoff Thursday with four European Galileo navigation satellites.

A Soyuz rocket and Fregat upper stage lifted off Saturday from the Baikonur Cosmodrome in Kazakhstan, delivering 34 more satellites to orbit for OneWeb’s space-based Internet network in the company’s second launch this year.