Astranis said all four of its recently launched broadband satellites have passed early tests and begun using electric ...

Scientists have discovered a rare six-planet system where all planets orbit their star in perfect mathematical harmony.

The National Reconnaissance Office launched new spy satellites into lower Earth orbit late Thursday, adding to the growing ...

The launch marks the seventh deployment in the NRO’s new “proliferated architecture” strategy, which emphasizes smaller, ...

A spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole. The European and Japanese robotic ...

Alinda is one of the five largest near-Earth asteroids, coming closer than 9.3 million miles until the year 2200.