The flight of Apollo 13 in April 1970 was one of the most dramatic events in the history of human spaceflight –- and ultimately one of NASA’s finest hours. For three days, the lives of three astronauts who had been bound for the third lunar landing mission hung in the balance.

The U.S. Air Force claims the new LISC deal could save up to $1.8 billion over 10 years, although skeptics question how.

Ahead of next week's Space Symposium in Colorado Springs, our editors discuss the latest on an American-built engine to send U.S. national security assets to space, competition between ULA and Space X, the state of U.S.-Russian relations and more.

Blue Origin plans to begin autonomous flight tests later this year with the reusable New Shepard suborbital human spacecraft it will power.

The space shuttle was a magnificent machine, the most capable spaceship ever built. It was also a fragile monster that required an expensive standing army to fly, and punished the slightest inattention to detail in its preparation and operation with fatal results.

A new concept puts Mars in reach with today’s NASA budget. The trick is a stop in Martian orbit, and a flight-test landing on Earth’s Moon.