The most striking feature of the Almaz station was the 23mm Nudelman-Rikhter (NR-23) cannon, a modified aircraft gun adapted for use in the unforgiving vacuum of space.

There's no shortage of round celestial objects in our universe. Planets, moons and stars all exhibit lovely spherical shapes.

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

Simulations show that the stars’ tug could send Mercury, Venus or Mars crashing into Earth — or let Jupiter eject our world from the solar system.