It's been 25 years since the Space Shuttle Discovery lofted the Hubble Space Telescope into orbit. Yet astronomers were not unanimous in their enthusiasm for the project, as this debate from 1990 recalls.
Although typically weak, the annual Lyrid display will benefit from moonless skies. This year's peak, late on April 22nd, favors Europe over North America.
After serving as caretakers of Canada's largest telescope for years, volunteers from the RASC's Toronto club have been given the historic facility outright.
Amateur skygazers can satisfy their celestial cravings with Globe at Night, International Dark-Sky Week, Astronomy Day, and Global Astronomy Month.
Amateur astronomy has lost a true pioneer, a keen observer who founded the worldwide Association of Lunar and Planetary Observers.
Most sources say April 4th's lunar eclipse will be total, though only barely so. However, those calculations have overlooked a subtle factor that might render the event only "partial."
The stars of northern winter linger in the west as celestial bears, a lion, and a snake climb in the east. Meanwhile, Jupiter and Venus sparkle overhead.
With risky prospects on far-northern islands and at a premium aboard aircraft, observers looked on with awe as the Moon's shadow swept across the Arctic Ocean
As the countdown for Friday's total solar eclipse nears zero, "umbraphiles" from around the world are flocking to remote parts of the far north in the hope of finding clear skies.
With just weeks left before it crashes into its host planet, NASA's Messenger spacecraft is making the most of its extremely low altitude and finding that Mercury isn't a completely dead world.
A radar sounder aboard China's first-ever lunar lander found at least nine discrete subsurface layers at its landing site in northern Mare Imbrium.
The long-distance traveler has finally arrived at the first dwarf planet (and largest asteroid) yet studied by spacecraft.
What's it like to fly on SOFIA — a repurposed Boeing 747 with a huge rectangular hole in its side and a state-of-the-art telescope peering out through it?
Incoming views of the asteroid belt's largest body reveal spots where ice from the interior might be exposed on the surface.
As we transition between seasons, Orion rides high in the evening sky — easily found by spotting the row of three bright stars in his Belt.
Earth's two closest planetary neighbors draw strikingly close together this week.
Some of the prettiest nighttime sights involve the close pairing of two solar-system bodies, and February features events with the Moon and Jupiter, then Venus and Mars.
Once the Rosetta spacecraft arrived at Comet 67P/Churyumov-Gerasimenko last August, European scientists used an array of instruments to assess every nook and cranny of the remarkable two-lobed nucleus.
For the second time in as many months, the periodic comet 15P/Finlay has surged in brightness. Spot it soon — before the Moon interferes — using our exclusive sky charts.
It's been 11 years since the British-built Beagle 2 lander dropped to the Martian surface and disappeared without a trace. Now we know what happened to it.
When the massive, unstable southern star Eta Carinae sent a blast of X-rays into space last July, astronomers around the world were waiting and watching.
Where, exactly, did our oceans come from? New research suggests that asteroids might have both delivered and removed lots of water — and that Earth itself might have locked it away deep inside.
Our downloadable monthly podcast offers highlights for stargazing in January, how to find the planets, and a special look at the Pleiades star cluster
A highly successful spacecraft has ended its mission after returning nearly a decade of data on Earth's nearest planetary neighbor.
In a quartet of high-quality videos, Sky & Telescope editors offer newcomers solid, objective tips on how to buy, use, equip, and care for new telescopes.