NASA human-spaceflight managers are evaluating whether it will be possible to switch to a more capable upper stage for the heavy-lift Space Launch System (SLS) in time for its first flight with a crew.

This week's aerospace and defense news you don't want to miss, including the Vulcan Bomber's last ever flight and Bombardier's $1bn investment boost for C Series.

The Cassini spacecraft is prepared to make its most detailed measurements yet of the curtain-like ice sprays from the south pole of the Saturn moon Enceladus.

NASA’s congressional overseers have questioned the relevance of both the asteroid capture and astronaut rendezvous to the agency’s ultimate objective of reaching the Martian environs with human explorers in the 2030s.

Our roundup of stories you may have missed this week, including an update on Finland's fighter jet replacement program.

NASA astronauts are set to resume external upgrades to the International Space Station intended to prepare its U.S. segment for future commercial crew vehicle dockings.

Scientists expected the north polar region of Enceladus to be heavily cratered, based on low-resolution images from the Voyager mission, but the new high-resolution Cassini images show a landscape of stark contrasts.

NASA is weighing a robotic Mars-landing mission as early as 2026 to flight test critical technologies with subscale components in preparation for a human landing.