261–280 of 6,712 results
satellite orbits (artist's illustration)

Science and Space Policy

Proposed NOAA Budget Kills Program That Was Designed to Prevent Satellite Collisions

Trump’s first administration helped establish the Traffic Coordination System for Space (TraCSS). His second administration wants to dismantle it.

The image is a detailed and colourful visualisation of the cosmic web, which shows the large-scale structure of the Universe. The left side of the image is filled with blue and purple colours and is a bit wispier/darker. The right side has bright orange and yellow colours and is much bolder/brighter. In the centre, there is a bright green-blue area where these two sides meet, forming a complex network of filaments that connect various clusters of galaxies. The text ‘ILLUSTRIS’ appears in small font at the bottom right corner.

Cosmology

Astronomers Map the Cosmic Web

A 23 million light-year-long gaseous filament and 39 bursts of radio waves are helping astronomers chart the universe's largest-scale structures.

Eos molecular gas cloud illustration

Astronomy & Observing News

Giant Gas Cloud Discovered 300 Light-Years from Earth

Astronomers have just spotted for the first time a huge cloud of cold hydrogen gas just 300 light-years from Earth.

Comet 3I/ATLAS amateur view

Celestial News & Events

Rare Interstellar Comet Buzzes Solar System

A newfound comet from a remote star system may become bright enough to see in amateur telescopes this November.

Celestial News & Events

This Week's Sky at a Glance, July 4 – 12

On Sunday night the Moon occults Pi Scorpii for almost all of North America. Elsewhere in Scorpius, the Cat's Eyes point side-eye to the Little Cat's Eyes.

ISS

Space Missions

See Multiple International Space Station Passes This Fourth of July Weekend

Early July is a great time to catch multiple passes of the International Space Station passes in a single night. Here's why.

Double Novae image V632 Lupi and V572 Velorum

Celestial News & Events

See Dual Naked-Eye Novae, a Rare Cosmic Coincidence

What's rarer than a naked-eye nova? Having two of them at the same time!

Scorpius from Stellarium

Night Sky Sights

July Podcast: Scorpius in the Spotlight

Let’s explore “what’s up” in the July sky. This month we’ll check on the planets' whereabouts, go on a "sat-seeing" tour, and chase down one of best know celestial critters: Scorpius. So grab your curiosity, and come along on this month’s Sky Tour episode.

ALMA's Jellyfish

Galaxies

Jellyfish Galaxy Sheds Spiral Arms in “Bunny Ear” Tails

Astronomers have imaged a "jellyfish" galaxy in detail, revealing that its spiral arms now drag behind it as a pair of tails.

Georgia bolide June 26, 2025

Celestial News & Events

Exploding Fireball Drops Meteorites Over Georgia

Space rocks pelt Georgia after Thursday's thunderous bolide.

Webb's first planet

Exoplanets

James Webb Space Telescope Discovers Its First Planet

The Saturn-mass planet candidate is probably newly formed and orbits a young star that's only 6.4 million years old.

Moon and Mercury at dusk, June 27, 2025

Celestial News & Events

This Week's Sky at a Glance, June 27 – July 6

Mercury, Regulus, and Mars drift apart as they descend in the western twilight. After dark, check out double stars in the head of Scorpius. . . where occultation action is coming up.

2-day-old crescent

Celestial News & Events

Explore June's Dusky Crescent Moon

The Moon returns to the evening sky this week to show off its elegant crescent and invite us to tour its nightside.

Berlin at night

Astronomy and Society

Light Pollution: What Is Brightening Our Night Skies?

Walking through neighborhoods, volunteers identified sources of light pollution —surprisingly, streetlights weren’t the main culprit.

Another piece of the Virgo Cluster (plus background galaxies)

Professional Telescopes

Vera C. Rubin Observatory Releases Long-Awaited First Photos

We're now seeing the first images after years of effort and frantic last-minute fixes that pushed the new observatory to completion.

SPHEREx's window on the sky

Professional Telescopes

Swim Through Images from NASA's SPHEREx Observatory

Images from a unique new space observatory are in, showcasing its potential for exploring the universe near and far.

Moon and Mercury low in the dusk, June 26, 2025

Celestial News & Events

This Week's Sky at a Glance, June 20 – 29

With summer finally here, summery Scorpius awaits you as night grows late. The Moon prepares to molt from old to new and greet Mercury in twilight.

Nova Lupi (V462 Lupi) June15

Celestial News & Events

Bright Nova Lights Up Lupus Constellation

A newly-discovered nova in Lupus is on the rise and approaching naked-eye visibility. Here's how to see it.

Science and Space Policy

“Shattering” NSF Budget Proposal Threatens Gravitational Wave Science

One of two Nobel Prize-winning LIGO sites is on the budgetary chopping block.

Exoplanets

Exoplanets

Silicate Clouds and a Dusty Disk in a Multi-Planet System

James Webb Space Telescope observations of two young planets 326 light-years away show a series of surprises.