Four educator astronauts carried on Christa McAuliffe's mission of venturing to space as a teacher, including two who revived her lost space lessons.

That resolute serenity was very much reflected in a speech that their Prime Minister, Mark Carney, gave two days later, at ...

NASA's Space Shuttle Program, which ran from 1981 to 2011, was a complex and ambitious project that pushed the boundaries of ...

Candidates participating in the debate include Steve Hilton, Tom Steyer, Eric Swalwell, Tony Thurmond, Antonio Villaraigosa, ...

President Donald Trump painted a simplistic picture for the US operation in Venezuela: go in, get the oil and start exporting ...