WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these "toasted marshmallow" planets could be more complicated than thought.
Wrinkle ridges that formed in the past 160 million years suggest recent geological activity on the moon.
The next Sputnik Moment will take place against the backdrop of great power competition, as it did in the 1950s. This time, the top contenders are the U.S. and China.
There are many obstacles to overcome before humans can set foot on Mars, including problems surrounding launch mass and closed-loop systems and the hazards of space radiation.
For 366 days, six analog astronauts lived and worked in a sealed environment in Russia, an Earth-based stand-in for interplanetary missions of the future.
Black holes that have been obscured by clouds of dust still emit infrared light, enabling astronomers to spot them for the very first time
Athena, the second lunar lander from Intuitive Machines, is set to launch soon, carrying NASA payloads and Nokia's first-ever moon-based 4G network.
Satellites have detected electromagnetic signals generated by ocean tides, suggesting that space-born sensors could obtain insights into the motion of other liquid masses on Earth.
Earth is home to some truly bizarre and breathtaking landscapes — here are 20 that look straight out of an alien world.
The discovery of a new asteroid this month has turned out to be Elon Musk's Tesla Roadster launched by SpaceX in 2018.
