As an example, the four astronauts unveiled the U.S. flag in their SpaceX Crew Dragon spacecraft ... when coordinated terrorist attacks in several states killed about 3,000 people on Sept.

The role of Elon Musk's SpaceX in an ambitious new U.S. missile defense system is in question following the dramatic feud ...

President Donald Trump made a bold promise to America minutes after taking the Oath of Office: pledging that an American flag would be planted on Mars. "The United States will once again consider ...