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.
An early outcome from Rosetta's scrutiny of Comet 67P/Churyumov-Gerasimenko is that the isotopes in its water have distinctly different ratios than those on Earth.
NASA's Dawn spacecraft spent 14 months photographing Vesta from close range. Now geologists have completed a global map of the asteroid's surface geology.
Right on cue, New Horizons spacecraft has awakened from its final electronic hibernation. Seven months from now, it will make the first-ever visit to Pluto.
The annual Geminid meteor shower, one of the best shooting-star displays each year, returns to our skies late this week. Despite interference from moonlight, plenty of bright meteors should still shine through.
Last year the University of California ordered its astronomers to make historic Lick Observatory self-supporting by 2018. Now there's been a change of heart, and the university will continue to pay for its operation.
Our monthly podcast offers the key highlights for stargazing in December: where to find bright stars and planets — and how to spot the Geminid meteor shower.
Despite rescue efforts, no one has heard from one of two NASA spacecraft on the far side of the Sun since October 1st.
Scientists think they've figured out what causes the mysterious ruddy coloring in the giant planet's enormous oval storm.
With its battery power failing, Philae became the "little lander than could" and managed to return results from all 10 of its science instruments before slipping into hibernation.
After free-falling toward Comet 67P/Churyumov-Gerasimenko for seven hours, ESA's Philae lander bounced on the surface twice before finally coming to rest.
A fresh look at a nagging problem — asteroids moving in comet-like orbits — concludes that asteroids must make up about 4% of the vast, distant Oort Cloud of comets. When a telescope atop Hawaii's Haleakala swept up a fast-moving object in August 1996, astronomers didn't know what to make of it. Designated 1996...
The Rosetta spacecraft reached its objective, Comet 67P/Churyumov-Gerasimenko, in August. Since then, one instrument has been "smelling" the mix of gases escaping from the comet's nucleus.
A Chang'e spacecraft swung around the Moon and its capsule landed safely on Earth — a dress rehearsal for a future mission to bring back lunar samples.
A mythic drama plays out in the stars above on November evenings. Taking center stage, almost directly overhead at nightfall, is Cassiopeia, the Queen.
Mercury moves fast around the Sun and changes location in the sky quickly. But you can spot it before sunrise in early November. Here's the info you'll need!