The Starliner saga is a step closer to its end with the launch of a SpaceX vehicle that will relieve the astronauts who flew on the Boeing spacecraft.

Launched Tuesday night from California by SpaceX, the Spherex observatory will survey the sky every six months from an orbit over Earth's poles.

SpaceX launch scheduled for Wednesday will carry replacement crew for astronauts who have been stuck on the International ...

SPHEREx hopes to solve some of the universe's biggest mysteries, while PUNCH will study the sun’s outer atmosphere, the corona. Here's what to know.