First spied last year, an object designated 2015 RR245 turns out to be one of the largest and most distant objects yet found orbiting the Sun.
A small town with a population of 205 will be the destination for Sky & Telescope's Wyoming solar-eclipse tour in 2017.
Sky & Telescope's astronomy podcast takes you on a guided tour of the night sky. In early evening look for Jupiter in the southwest, with Mars and Saturn embedded in Scorpius toward south.
Sky & Telescope's astronomy podcast takes you on a guided tour of the night sky. After the Sun sinks from view, enjoy watching Mars and Saturn near Scorpius in the southeast and Jupiter near Leo well up in the southwest.
May 9th's transit of Mercury is now history. Countless amateurs — and professionals — watched as the innermost planet had its day in the Sun. It's sometimes the curse of being involved in astronomical outreach that I miss all the action during an important celestial event. For example, I never got to see Comet Shoemaker-Levy…
Join in Monday, May 9th, as tiny Mercury crosses the Sun's disk for the first time since 2006. S&T's exclusive video feeds and expert interviews will air throughout the 7½-hour event.
Sky & Telescope's astronomy podcast takes you on a guided tour of the night sky. Watch for Mars and Saturn near Scorpius before dawn and Jupiter near Leo after sunset.
Astronomers have been searching for companions to the distant dwarf planet Makemake for years. Finally, they've spotted one.
Our state-of-the-art representation of the entire celestial sphere lets you explore the stars above as never before.
If you've never seen the fleet-footed planet Mercury, now is a great time to look for it in the evening sky after sunset.
Join the world’s largest celebration of astronomy — in person or via online webcasts of events — throughout April.
What began as a student's simple idea a decade ago has grown into a worldwide celebration of the night sky and easy ways to reduce light pollution.
This month's astronomy podcast takes you on a guided tour of the night sky. You'll find Mars and Saturn near each other before dawn, while Jupiter and Mercury join the fading constellations of winter in the evening sky after sunset.
Two amateur videos shot early on March 17th show a brief but bright flash on the edge of Jupiter's disk. Did the King of Planets get whacked again?
Observations by NASA's New Horizons spacecraft, combined with new modeling of long-term trends, suggest that Pluto's atmosphere is far more dynamic than anyone imagined.
After a string of four consecutive total lunar eclipses, West Coast residents get to see one that requires careful attention to appreciate.
Skygazers thronged to Indonesia hoping to see a total solar eclipse — and most were rewarded with breathtaking views of the event.
On March 9th — late on Tuesday, March 8th, in the U.S. — the Moon will completely cover the Sun. Check here for the links you'll need to see this celestial spectacle as it happens.
After months of excitement in the predawn sky, the action is shifting to the evening — where Jupiter rises early and the stars of Orion anchor an array of celestial sights.
Among its other geologic oddities, Pluto has clusters of hills floating in a frozen "sea" dominated by nitrogen ice. These bobbing bumps might hold clues to the plain's depth and evolution.
Two planets and a pretty crescent Moon gather low above the southeastern horizon before dawn on February 6th.
The first days of February offer your best chance to see all of the naked-eye planets — from Mercury to Saturn — together with the Moon in the predawn sky.
A blazing-bright fireball that lit up the early evening sky on January 30th appears to have scattered meteorites near the Pennsylvania- Maryland border. Now the search is on to find them.
This month's audio sky tour starts before dawn, when you can spot all five bright planets by eye, and moves to the sparkling stars seen on winter evenings.
There will be four eclipses in 2016. Highlights are a total solar eclipse on March 9th (visible from Indonesia) and an annular solar eclipse on September 1st (central Africa). But we'll see just two barely-there penumbral eclipses, on March 23rd and September 16th.