Photos: Atlas 5 rocket aims for International Space Station

SpaceX’s upgraded Dragon capsules will not return astronauts to Earth for powered landings as originally envisioned, company boss Elon Musk said Wednesday, a design change that raises questions about the space transport firm’s plans to send commercial landers to the surface of Mars.

The mobile service tower retracts from the Atlas 5 rocket, revealing the 197-foot-tall vehicle for liftoff from Vandenberg Air Force Base, California, carrying the classified NROL-42 national security payload for the U.S. government.

Relativity Space’s co-founder and chief executive says his company is working on innovations in manufacturing and rocket technology, and plans to use 3D printing at unprecedented scale in the space industry to ease access to space for a range of satellite operators, joining a fray of smallsat launchers saturating the market.