In a borderline eclipse of the Moon like last Saturday's, the difference between "total" and "partial" depends on some crucial assumptions.
The new Comet Lovejoy, C/2014 Q2, should brighten from 5th to 4th magnitude from late December through January as it climbs into excellent viewing position for the Northern Hemisphere, high in the dark winter sky.
A new Comet Lovejoy, C/2014 Q2, is heading our way. It may brighten to 5th magnitude from late December through much of January as it climbs into excellent viewing position for the Northern Hemisphere, high in the dark winter sky.
Sky & Telescope predicts that 2015's best meteor showers will be the Perseids in mid-August and the Geminids in mid-December.
Fooled by shadow play into thinking lunar mountains were pointy pinnacles? Learn why we often see them that way.
Watch an asteroid approach a star and block its light, all in a fraction of a second.
Reports describing this morning's lunar eclipse are beginning to trickle in to our offices in Cambridge, Massachusetts.
Lonely Fomalhaut turns out to have plenty of company. Learn how to find its two remarkably distant stellar companions.
Start your day with an eclipse of the full Moon! On the morning of October 8, 2014, a total lunar eclipse will be visible across most of North America.
Learn exactly how and when to expect the next display of the northern lights with a few easy-to-use online tools.
Get acquainted with SS Cygni, the sky's brightest cataclysmic variable star. It's guaranteed to keep you on your toes.
International Observe the Moon Night is an event that encourages people to "look up" and enjoy our nearest neighbor. This year's InOMN is Saturday, September 6th. Here's a quiz: What astronomical object looks amazing no matter what the magnification, never looks exactly the same no matter how often you view it, and can be...
With a subtle beauty all its own, the earthshine we see glowing in the lunar night invites us to consider Earth's many connections to the Moon.
You'll be entering uncharted territory when you seek out this little known 'Shadow of the Veil' in Cygnus this summer.
The next time you're out watching a sunset, turn around and relish the mighty shadow of Earth looming just behind your back.
Fascinating faculae provide a way for anyone with a small telescope to track the ups and downs of the solar cycle — even when there are no sunspots.
Channel your inner superpower by looking up at the night sky precisely when a dazzling blaze of light is beamed to Earth from outer space.
Not every set of closely paired stars requires binoculars or a telescope to "split". Here's a guide to summertime doubles you can tackle with your eyes alone.
Two bright asteroids now appear extremely close to one another in the evening sky. Here's how to spot them in binoculars or a small telescope.
Your first view of Saturn with a telescope can introduce you to the riches of stargazing — and now is the perfect time to observe it. Saturn is entering the early evening sky this spring just as Jupiter begins its exit in the west. Here's a quick guide to spotting the ringed planet by...
Astronomers don't know why Jupiter's iconic Great Red Spot has been gradually shrinking since the 1800s — or why the downsizing has accelerated during the past two years. Update: On May 15th, NASA released newly taken images of the Great Red Spot (at bottom below) to show its declining size since 1995. Thanks to...
Uranus and Neptune are easy to find with the aid of the charts in this article.
This star-studded pool of misty light provides a feast for observers.
Explore the Moon with binoculars or a telescope.
The King of Planets reached opposition in the first half of January but it's still big and bright, a captivating sight no matter how you look at it.