The first crewed flight of Boeing's Starliner spaceship was dramatically called off just two hours before launch after a new safety issue was identified, officials said Monday, pushing back a high-stakes test mission to the International Space Station.

Near the moon's south pole lies a 13-mile wide, 2.5-mile-deep crater known as Shackleton, named for Antarctic explorer Ernest Shackleton. Shackleton—and craters like it—may contain untapped resources that can be accessed with lunar mining.

Ever wonder what happens when you fall into a black hole? Now, thanks to a new, immersive visualization produced on a NASA supercomputer, viewers can plunge into the event horizon, a black hole's point of no return.

The stage is set for some space history to be made tonight as two veteran NASA astronauts aim to launch in a spacecraft that has never flown with humans before.

China has released a geologic atlas set of the global moon with a scale of 1:2.5 million, which is the first complete high-definition lunar geologic atlas in the world, providing basic map data for future lunar research and exploration.

Primordial black holes are hypothetical objects formed during the earliest moments of the universe. According to the models, they formed from micro-fluctuations in matter density and spacetime to become sand grain-sized mountain-massed black holes.