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 reclassified Pluto as ...

Chiron is a class of comet-ish asteroids/asteroid-ish comets called centaurs – named after the half-human, half-horse hybrid ...

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

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

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 ...

We're hurtling toward a new era of mega-rockets with enough power to send colonists to the red planet, but should we?

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 ...