Planet X, also called Planet Nine, is a hypothetical planetary body seven times the mass of Earth lurking behind Pluto. If ...

A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union reclassified Pluto as ...

A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union classified Pluto as a ...

NASA Administrator Bill Nelson left a final decision on a new mission architecture to the next NASA administrator working ...

Researchers have created a high-power tunable laser on silicon photonics, achieving nearly 2 watts using an LMA amplifier.

NASA astronaut Don Pettit's video of an "intensely green" aurora from the ISS has stirred online speculation about its ...

The Biden administration released long-awaited final rules Friday for a tax credit that will send billions of dollars to ...

TechRadar will be extensively covering this year's CES, and will bring you all of the big announcements as they happen. Head ...

NASA announced Tuesday it may turn to Elon Musk's SpaceX or Jeff Bezos's Blue Origin to help reduce the soaring costs of ...

Bezos' New Glenn and Musk's Starship both are heading for launch, and both could lift off in close timing to each other. Here ...

NASA says it has a dual approach plan to bring home potential proof of life on Mars by 2035 after updating its Mars Sample ...