Each Monday, I pick out North America’s celestial highlights for the week ahead (which also apply to mid-northern latitudes ...

A new moon is when the moon shares the same celestial longitude as the sun; the two bodies are said to be in conjunction.

Catch a delicate crescent moon from Sept. 23–27 and watch it pair with Spica, Mars and Antares in the west after sunset.

So do China and Russia. Here’s what you need to know about America’s new lunar-energy race ...

The moon and Venus will shine vividly alongside a bright star in the early morning in a celestial rendezvous that should be visible across the U.S.

THE term “harvest moon,” originating in England, where the brilliant moon-light of several consecutive evenings aided the ...

Some observers may have noticed a faint glow illuminating the darker portion of the moon-a phenomenon known as Earthshine or the Da Vinci glow. It occurs when sunlight reflects off Earth and softly ...

The Earth stands alone in the solar system as a habitable world, as far as we know. But that doesn’t mean we don’t get visitors, most often in the form of (usually harmless) asteroids. Some even ...

Regulus, a distant star, Venus and our moon will be visible during a conjunction tonight, and how Californians can best see ...

Did you see the bright star next to the moon? That was Venus, and part of a conjunction between the moon, Venus and the star ...

On September 19, the waning crescent moon will rise with Venus and Regulus, while parts of the world see a rare occultation.

Saturn’s moon Enceladus has long dazzled scientists with its icy plumes that spew water and mysterious organic molecules into space, fueling hopes of a habitable ocean beneath. But new experiments ...