Air Force Secretary Troy Meink's announcement is the first official U.S. acknowledgment of space-based weapons.

The ethereal zodiacal light, also called the false dawn, shines before sunrise in the eastern sky this morning.

The Moon, Venus, Spica, and Mercury now all stand in a line tonight, but only if you’re quick — Mercury sets soon after the ...

Europe's Vega C lifts a pair of Earth-observation satellites from French Guiana, China targets five launches, and Russia ...

Three celestial objects form a triangle in the evening twilight as Venus and the crescent Moon hang with Virgo’s brightest ...

Dione crosses Saturn’s north pole, projecting its shadow onto the cloud tops as Tethys disappears into the planet’s shadow.

Dark-sky sights take center stage as Saturn's moons dance and Venus mingles with the Moon in the sky this week.

Reid Wiseman, Victor Glover and Jeremy Hansen will join Starmus VIII in Tenerife and La Palma, continuing a remarkable ...

Bars can form in any galaxy with ordered rotation; it is primarily the quantity of dark matter that controls whether a bar is present.

Now in Cancer, our waning Moon hangs close to Jupiter. The gas giant is a great telescopic target, with cloud patterns and ...

The Dumbbell Nebula in Vulpecula is a great target for any telescope under this evening’s dark, moonless skies.

Earth's satellite skims through several constellations, meeting up with planets and stars in the sky this week.