As the four-person crew of Artemis II prepares to launch on a historic mission around the moon as soon as February, some experts are worried about the Orion spacecraft’s heat shield.

WASHINGTON — NASA plans to test SpaceX’s Starshield satellite network, designed primarily for national security customers, to support operations of the agency’s Deep Space Network. In a Dec. 11 ...

President Donald Trump is expected to sign the legislation, H.R. 6938, that would provide NASA with a $24.4 billion budget ...