41–60 of 6,051 results
Big and Big Arc portrayed as dots on a sky map


Astronomers Find "Big Ring" 1.3 Billion Light-Years Across

Standard cosmological scenarios might not explain the breadth of a newly discovered cosmic structure.

Moon passing Pleiades and Aldebaran, Feb. 16-17, 2024

Celestial News & Events

This Week's Sky at a Glance, February 16 – 25

The Moon waxes from first quarter to full this week, traveling from the Pleiades past the not-quite-twin heads of Gemini to the Sickle of Leo. The Big Dipper and Cassiopeia stand in balance. Venus meets Mars low in the dawn.

Magnetar getting ready to launch an FRB

Stellar Science

Neutron Star "Glitches" Are Clue to Mysterious Radio Bursts

New observations of a neutron star in the Milky Way's center shed light on what makes mysterious fast radio bursts.

Intuitive Machines launch photo

Astronomy in Space with David Dickinson

The Nova-C Lander Launches for the Moon

The second Commercial Lunar Payload Services mission of 2024 IM-1 Nova-C heads Moonward.

Galaxy clusters through time


Largest-ever Catalog of X-ray Sources Tests Cosmology 

Results from a brand-new high-energy observatory are rocking the field of cosmology. In particular, a study of more than 5,000 galaxy clusters relieves tension in the standard cosmological model.

Southern Stargazing with Jonathan Nally

Get to Know the Carina Constellation

The southern constellation Carina contains arguably the best nebula in the sky, along with a host of other fascinating stars and clusters.

Triple stars finders

Explore the Night with Bob King

Winter's Finest Triple Stars

Double stars are wonderful, but triples are terrific! Here are 16 trios to enjoy the next clear night.

Eclipse glasses

People, Places, and Events

How to Do Eclipse Outreach On and Off the Path

One of the best parts about the eclipse coming up on April 8th will be the opportunity to share the joy and amazement with others!

Blue spiral galaxy with golden center


Using Ancient Ultraviolet Light to Probe Theories of Cosmology

By studying the formation and evolution of galaxies in the early universe, researchers seek to test the predictions of our leading theory of cosmology.

Moon passing Pleiades and Aldebaran, Feb. 16-17, 2024

This Week's Sky At a Glance

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

The first-quarter Moon passes the Pleiades, then Aldebaran. Cassiopeia stands on end. For the southern U.S., Canopus culminates far under Sirius.

Solar system poster points out a

Solar System

How Venus Ended Up with a Mini-Moon Named Zoozve

A quasi-satellite of Venus has just received an unusual name.

Spiral galaxy with a bustling core, Webb's view shows orange-bright dust at top left, Hubble's view shows stars at bottom right


Webb Telescope Unveils 19 Galaxies in a New Light

A James Webb Space Telescope survey known as PHANGS has revealed exquisite, just-published details in 19 nearby galaxies.

Mimas appears like the Death Star

Solar System

Does Saturn's "Death Star" Moon Harbor an Ocean?

New evidence, based off of NASA's Cassini measurements of Mimas's orbit, suggests the icy "Death Star" moon might have a subsurface ocean.

Detailed image shows volcanoes on Io's surface

Astronomy in Space with David Dickinson

NASA's Juno Mission Makes Closest Flyby Past Io

Juno has revealed Jupiter's volcanic moon Io as never before.

a blue arc on top looms over an active, lumpy-looking star


Hubble Reveals Possible Water-Vapor World

New Hubble Space Telescope observations reveal the warm sub-Neptune GJ 9827d might have a steamy atmosphere.

Waning Moon passing through Scorpius, Feb. 4-6, 2024

Celestial News & Events

This Week's Sky at a Glance, February 2 – 11

Under Orion is the Hare, which you may know, and under the Hare is the Dove, which you may not. February the best month for both.

Orion and nearby constellations

Sky Tour Astronomy Podcast

February Podcast: Orion and His Cosmic Critters

As told in this month’s Sky Tour astronomy podcast, Orion, the Hunter, dominates February’s evening sky, but he seems unaware of the cosmic prey that surrounds him.

12P/Pons-Brooks with tail

Explore the Night with Bob King

The Best Comets to Look for in 2024

If you like chasing comets, here's a guide to the year's best and brightest.


Space Missions

NASA Ends Mars Ingenuity Helicopter Mission

NASA’s ground-breaking Ingenuity helicopter, part of the Perseverance mission, comes to a rest on the Red Planet.

Berlin fall fragment

People, Places, and Events

Asteroid 2024 BX1: From a Light in the Sky to Rocks on the Ground

The asteroid 2024 BX1 went from a moving dot of light to rocks on the ground in mere hours — and amateur astronomers were critical to both discovery and recovery.