3681–3700 of 6,705 results

Celestial News & Events

Quadrantid Meteors Ring in 2014

Start the new year right by viewing an excellent but short-lived meteor shower, called the Quadrantids, which peaks on Friday, January 3rd.

Milky Way

Mapping the Milky Way's Arms

Astronomers continue to debate whether our home galaxy has big arms and some smaller appendages — or, as new results suggest, four major arms.

Orion Nebula

Observing

New Telescope? Learn How to Use a Telescope and See Amazing Sights

Thousands of telescopes are given and received as gifts during the holidays. But once you've assembled your new treasure, then what? The editors of Sky & Telescope show you where to look first.

Stellar Science

New Cutoff for Star Sizes

Astronomers have found a size gap between stars that fuse hydrogen in their cores and so-called failed stars, which never muster the ability to sustain fusion. This boundary could help observers precisely identify the smallest stellar citizens.

Variable star RS Puppis

Stellar Science

Watch a Mesmerizing Light Show

The gossamer veil of reflective dust surrounding the star RS Puppis reflects its flickering light in a fantastic display.

Exoplanets

Putting Exoplanets on the Scale

Astronomers have come up with a new technique for measuring an alien planet’s mass, and therefore its composition and potential habitability, even when standard methods don’t work.

Cosmology

Gaia Launches to Pinpoint a Billion Stars

Gaia launched flawlessly Thursday morning at 9:12 UTC (4:12 a.m. Eastern Standard Time). This long-awaited mission will precisely map the distances and motions of 1 billion stars in our galaxy.

Celestial News & Events

See Venus's Thin Crescent

Venus usually appears pretty boring through a telescope. But from mid-December to mid-February it's a spectacularly long, thin crescent.

Stellar Science

The Crab's Surprise Molecule

Astronomers have identified a molecule containing the noble gas argon in the Crab Nebula. It's the first such molecule detected in space and confirms predictions of where a certain argon isotope is created in the cosmos.

Yutu

Solar System

Chang'e 3 Brings Rover to Lunar Surface

For the first time since 1976, a spacecraft has landed safely on the Moon. Within hours, the Chinese spacecraft Chang'e 3 had deployed an instrumented rover.

Comet ISON on Nov. 15, 2013

People, Places, and Events

Last Chance to Enter S&T's Comet ISON Photo Contest

The "comet of the century" famously lost its battle against the Sun, but you can still enter our photo contest for a chance to win some hefty prizes. Don't miss the December 31st deadline!

Solar System

Curiosity Finds a Once-Habitable Mars

Ancient Mars seems to have had all the necessities as a comfy habitat for microbial life.

Giant Exoplanet

Exoplanets

Hubble Homes in on Hazy Worlds

Two teams have announced the discovery of water on alien worlds. But they found less water than expected, suggesting these planets are surrounded by a high-altitude haze.

Solar System

Plumes on Europa

New Hubble Space Telescope observations provide the best evidence yet that Jupiter's icy moon spits out water vapor from its surface. If real, such plumes could reach more than 100 miles above the little world's surface and rain down an extraterrestrial form of snow.

Solar System

Comet ISON: What We've Learned

Comet ISON's untimely demise didn’t prevent scientists from studying it, revealing the comet to be smaller than previously thought and harboring high concentrations of carbon.

Black Holes

A Double Black Hole?

Strange emission from a distant galaxy paints an enigmatic picture of what’s happening inside its core. One solution: instead of one supermassive black hole, the galaxy hosts two trapped in a tight dance around each other.

Solar System

New View of Saturn's Hexagon

NASA's Cassini spacecraft has captured phenomenal images of the gigantic weather system at Saturn's north pole. This so-called "hexagon" is nearly three times wider than Earth is.

Celestial News & Events

An Outburst of Andromedid Meteors

Astronomers report that a nearly forgotten meteor shower — famous for its prodigious "storm" in 1872 but long since inactive — has displayed surprising activity.

Meteor

Celestial News & Events

Geminid Meteors to Pierce the Moonlight

Bits of rock from a fried asteroid flash across the night sky in the mid-December sky — but bright moonlight will diminish the performance.

Astronomy & Observing News

Tour Chile with S&T!

Join Sky & Telescope as we travel to Chile, the "astronomy capital of the world." From March 27th to April 4th, 2014, we'll visit world-class observatories, see breathtaking landscapes, and observe in crystal-clear night skies.