One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at its closest point to Earth in its orbit, and Hall had one question on his ...

Northrop Grumman in Gilbert showed off the progress they have made on the NASA HALO capsule. The capsule will eventually be launched into space and orbit the Moon, providing a pit stop for astronauts ...

Orbital transfer vehicles launch atop rockets, carrying other spacecraft that they deliver to specific, often hard-to-reach, orbits. The new early-stage studies for NASA should be complete by ...