The sky rumbled and the ground shook as the three most powerful hydrogen-fueled liquid rocket engines ever built successfully boosted a U.S. government satellite into orbit. Developed by Pratt & ...

Ars Technica has been separating the signal from the noise for over 25 years. With our unique combination of technical savvy and wide-ranging interest in the technological arts and sciences, Ars is ...

ULA's Vulcan is due to send up on Aug. 12 a pair of U.S. Space Force national security satellites on one of the company's most ambitious-ever launches. The Vulcan rocket, which has flown twice before, ...

The final United Launch Alliance (ULA) Delta IV Heavy rocket carrying the NROL-70 mission for the National Reconnaissance Office (NRO) lifts off from Space Launch Complex-37 on April 9 at 12:53 p.m.

CAPE CANAVERAL, Fla. — A U.S. spy satellite thundered toward orbit Saturday afternoon atop the most powerful rocket flying today, a 23-story Delta IV Heavy that blasted off from Cape Canaveral Air ...