Mars’ moons are easily visible at night from the Red Planet. Larger Phobos is brighter, while smaller Deimos is still brighter than any star.

A wonderful celestial event known as a total lunar eclipse will occur in the skies above North America during the morning ...

A study led by SETI Institute scientist Matija Ćuk proposes that Saturn’s bright rings and its largest moon, Titan, may have both originated in collisions among its moons. This study was accepted for ...

The Moon passes 1.8° north of Venus at 4 A.M. EST, then passes 0.1° south of Mercury at 6 P.M. EST. Both planets are visible in the evening sky, though Venus is low, only about 12° high in the ...

New Moon occurs at 7:01 A.M. EST, bringing an annular solar eclipse to Antarctica and part of the Southern Ocean. Only travelers in these regions will see the Moon cover nearly all of the Sun’s disk, ...

The bright star Sirius dominates the southern sky late this evening, blazing high in the south around 10 P.M. local time. You can use this sparkling star to point your way to the open cluster M47 in ...

Full Moon occurs at 5:09 P.M. EST, bringing the light of the February Snow Moon to our nighttime skies. This name may seem particularly apt, given the weather much of the U.S. has been experiencing as ...

The Moon passes 4° north of Jupiter this evening at 9 P.M. EST. The pair is visible most of the night in the central region of Gemini. Early in the evening, the nearly Full Moon hangs to the upper ...

Albert Einstein’s theory of general relativity is just over 100 years old, and so far it has predicted the interaction between celestial objects and the space-time field very well. There are a few ...

In 2026, astronauts will travel around the Moon for the first time since the Apollo era, powerful new space telescopes will prepare to survey billions of galaxies, and multiple nations will launch ...

Saturn is on display in the early-evening sky this month along with Uranus and Neptune, both within reach of binoculars. Jupiter dominates the night, reaching opposition on the 10th. The gas giant is ...

We’re getting ready to say goodbye to the summertime constellations, including Cygnus the Swan, now about 40° high in the west two hours after sunset. Before this famous star pattern disappears, ...