The first test of the methane-burning Raptor rocket engine marks a key step toward the start of flight tests of SpaceX's multipurpose, interplanetary-class space transportation system.

Earth’s life-essential elements may have been delivered through the same impact with a Mars-sized planetary body that produced the Moon more than 4.4 billion years ago, a research effort says.

In a shocking move just three months after founder Paul Allen's death, Stratolaunch has abandoned development of a family of dedicated launchers and PGA rocket engines.

The first U.S. missile defense review in nine years will present the Space Sensor Layer as a necessary upgrade for U.S. forces to confront a growing array of hypersonic boost-glide and cruise missiles.

“To continue delivering for our customers and to succeed in developing interplanetary spacecraft and a global space-based internet, SpaceX must become a leaner company," the company says.

A future sat constellation aimed at tracking zigzagging hypersonic glide vehicles will soon enter the prototyping stage, the U.S. Missile Defense Agency says.

NASA’s New Horizons mission team greeted the first signals on Jan. 1, confirming their spacecraft had successfully carried out its close flyby of Ultima Thule.

A SpaceX Falcon 9 rocket poised to deliver the first satellite of the U.S. Air Force’s next-generation GPS III network remained on the ground Dec. 18 after an automated abort.