The four astronauts aboard the Orion spacecraft are heading to the Moon after completing the critical engine burn that ...

The engine firing provided a slingshot-like boost to the Orion capsule, speeding it to 24,500 mph, the velocity needed to break free of Earth's gravitational clasp for a trek to the moon.

Every night, the sky does something invisible and enormous. Heat escapes from Earth’s surface upward through the atmosphere and out into the cold of space. This is a process as old as the planet ...

Four astronauts are preparing to sit atop a 322-foot rocket destined for the moon. They will be the first people to feel the Space Launch System shake with 8.8 million pounds of thrust – the ...

Engineers have built a modern Stirling engine that quietly turns the cold of outer space into steady mechanical power, using the night sky as a heat sink instead of a fuel tank. By radiating heat away ...