21–40 of 5,593 results

Astrophotography: Tips & Techniques

Photographers "Capture the Dark" in Stunning Images

The International Dark-Sky Association celebrates photography's role in the fight against light pollution. Here are this year's contest winners!

Tarantula Nebula in infrared looks more like a cavity surrounded by spider silk

Spacecraft and Space Missions

Webb Captures an Exoplanet, a Brown Dwarf — and a Giant Tarantula

New Webb images reveal the space telescope's first exoplanet, first brown dwarf, and a stellar nursery teeming with activity.

Moon passing under Jupiter Sept 10-11, 2022

Celestial News & Events

This Week's Sky at a Glance, September 9 – 17

As the Moon wanes from full to last quarter, passing Jupiter and Mars along the way, darkness returns to the evening sky for constellation spotters and deep-sly observers.

Space Debris

Astronomy and Society

The Hazards of Uncontrolled Reentries from Space

A recent study examines the risk posed to human life by reentering space debris as the number of rocket launches continues to grow.

Vega brilliance

Explore the Night with Bob King

Vega, the Star at the Center of Everything

While we may quibble about how to pronounce its name, there's no denying that Vega is one of the most fascinating and useful stars in the heavens.

Waxing gibbous Moon passing Saturn at dusk, Sept 7-8, 2022

Celestial News & Events

This Week's Sky at a Glance, September 2 – 10

As the Moon waxes from first quarter to full, watch it cross the southernmost zodiac constellations, then pass Saturn and Jupiter. Along the way it occults a Teapot star.

Harvest Moon and Jupiter Sept 2022

Sky Tour Astronomy Podcast

September: Harvest Moon & More

Have you ever looked up at the night sky and tried to figure out what's what? September’s Sky Tour astronomy podcast will heighten your enjoyment of the bright stars and constellations now overhead.

BlueWalker 3 satellite panel dwarfs team that built it

Astronomy and Society

Bright New Satellites Join a Crowded Sky — Here’s How You Can Help

The imminent launch of a BlueWalker satellite, with a giant phased array antenna, portends a brightening night sky. Amateur astronomers can help record these changes with the goal of mitigating them.

Mauna Kea Observatories panorama

Astronomy and Society

Years of Tensions at Mauna Kea May End with Peaceful Negotiations

New stewardship of Mauna Kea, a dormant volcano that hosts some of the world's largest telescopes, could change the face of astronomy at the summit.

NGC 628 looks like a giant blue-gold maelstrom with a blue middle


Webb Reveals Jupiter, Puffy Planet, and Galactic Maelstroms in a New Light

Round out your week with these stunning views of the universe from the James Webb Space telescope.


Solar System

NASA's InSight Lander Finds Tropical Mars Is Dry

Evidence for water ice exists at the poles of Mars and even at mid-latitudes, but new evidence shows equatorial Mars is dry. The find has implications for past habitability and future human missions to Mars.

Moon crossing from Scorpius to Sagittarius, Sept. 2-4, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, Aug. 26 – Sept. 3

Scorpius lies down after dark and the Moon walks across it. Jupiter shines high in the southeast by midnight just about as big and bright as it can ever get. An hour or two earlier, Saturn reaches a good observing height.

Betelgeuse lightcurve with artist's concept of mass ejection

Stellar Science

Betelgeuse's Great Dimming: The Aftermath

The Great Dimming occurred when Betelgeuse coughed out a huge chunk of material, and the ejection took a toll on the giant star.


Solar System

First Inter-Venusian Asteroid Hints at a New Population

The discovery of an asteroid inside Venus's orbit might be the first of a new population within the inner solar system.

Battered Vesta


Observe Vesta — and Own a Piece of It, Too

Vesta's bright and easy to find in binoculars and maybe even with the naked eye in late summer skies. It's also just as easy to acquire a piece of it without a multi-billion dollar space mission.

Giant impact 65 million years ago

Solar System

Did the Dinosaur-killing Asteroid Have a Sidekick?

The asteroid that wiped out the dinosaurs 66 million years ago might not have arrived alone.

Moon passing Mars and Aldebaran, Aug 19-21, 2022

Celestial News & Events

This Week's Sky at a Glance, August 19 – 27

Late these nights, Saturn and Jupiter are about at their very biggest telescopically. Vega passes the zenith, and the Milky Way displays itself in moonless dark.

People, Places, and Events

Peering Up Into Prairie Skies

The Nebraska Star Party offers truly dark skies enjoyed by veteran observers and first-timers alike.

Astronomy & Observing News

Dusty Disk Discovered in the Twins’ Foot

A careful study of observations spanning decades has revealed that a star in Gemini is regularly eclipsed by a disk-shrouded companion.

Interferometry image of Rasalhague

Celestial Objects to Observe

Meet Rasalhague, the Star with the Snake

Rasalhague, a star rotating so fast it has squashed itself, has a fascinating connection to the mythology of healing.