A multi-year investigation revealed errors in our understanding of the Sun.
This week and early next will be your last chance to see five planets — six if you count Earth — at dawn.
Sky & Telescope predicts that the two best meteor showers in 2016 will be the Quadrantids in early January and the Perseids in mid-August.
Bright Capella plays it close to the vest when it comes to companions, but with a good map and steady skies you can track down its dwarf binary.
Comet Catalina returns this month with naked-eye potential. Follow its every move with our guide and maps.
After a late-night ramble through the Hyades cluster, the waning gibbous Moon will cover up the bright star Aldebaran for observers across North America Friday morning.
Want to see a star rock in real time? Observe the Sun in the crimson light of hydrogen alpha and watch it come alive.
Lunar eclipses are leisurely affairs a pleasure to watch and photograph.
Northern hemisphere observers have this month and next to get their best look at Rosetta's comet, 67P/Churyumov-Gerasimenko.
We pay a visit to Ceres, now the apple of the Dawn Mission's eye, as it creeps through Sagittarius this month
Like "catching some rays"? This weekend's Blue Moon invites us to explore the beauty and dazzle of crater rays, the tracks left by powerful impacts in the not-so-distant past.
Comet C/2014 Q1 PanSTARRS has been skirting the northern horizon since mid-June. Now it's ready to dip Down Under, where it may be visible with the naked eye in evening twilight.
It's no myth. Icarus makes a rare flyby of Earth this week. Here's how to see it in your telescope and live online.
It’s been a fantastic year for Pluto, and it’s only going to get more so. What better time to make your first (or second!) attempt at spotting the dwarf planet? Read on for a few tips to help you locate this dim object in the summer sky.
This article gives directions for finding Uranus and Neptune from June 2015 through March 2016.
Chips of Pallas grace meteorite collections around the world. See where they all came from when the asteroid reaches opposition this spring.
Walk in the astronauts' footsteps as you explore the places they visited in the heyday of Apollo program. Use these helpful maps to start you on your way.
Participate in a world-wide campaign to observe and photograph Comet 67P/C-G as it approaches and recedes from the Sun with Rosetta in tow. Your observations matter.
"One Ring to rule them all." Join me as we explore a unique class of galaxies forged in the chaos of collision.
With the Moon riding high this week, what better time to look for its three best-known yet enigmatic "ring" craters? We welcome back the waxing Moon this week. It's a chance for many of us to put dark-sky targets on the back burner and give some love to she who lights the night. During fall, the evening Moon…
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.