Skip to main content

Subscribe to Smithsonian magazine and get a FREE tote.

Sun

Earth’s magnetic field surrounds the planet, with illustrated field lines emerging from the north, in orange, and looping around to the south, in blue.

A Weak Spot in Earth’s Magnetic Field Is Growing, but Scientists Say Not to Worry. Here’s a Look at What Shields Us From Space Weather

Our planet’s magnetosphere has seen dramatic shifts across its history—even total reversals—but this recent wrinkle doesn’t pose a threat to life

A long-exposure view of the Milky Way, seen from Brandenburg, Germany, is cut through by the light trails of passing satellites.

Giant Mirrors in Space Could Bring Sunlight After Dark, One Startup Says—and Astronomers Are Concerned

Critics argue the satellites, billed as a way to harness solar energy at night, could hamper sky observations and may pose a threat to human and animal health

This image was captured by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter in October. 

More Than a Dozen NASA Spacecraft Have Glimpsed Interstellar Comet 3I/ATLAS. Now, You Can View New Images That They Captured

The space agency got a close look at the interstellar visitor over the past few months as it zipped by Mars and the sun

An artist's impression of a coronal mass ejection on a star

In a First, Astronomers Saw a Distant Star Shoot Some of Its Plasma Into Space

The powerful coronal mass ejection would have likely destroyed the atmospheres of any potentially habitable planets nearby

This glimpse of the northern lights was captured in Missouri on November 11, 2025.

The Sun Erupted With the Year’s Largest Solar Flare This Week, and Space Weather-Fueled Aurora Activity Could Continue

The last in a series of three coronal mass ejections hit Earth on Wednesday, so experts are keeping an eye on geomagnetic storm potential

Researchers studied space dust in ocean sediment cores from the Arctic.

Researchers Used Space Dust to Build a Timeline of 30,000 Years of Arctic Sea Ice

Understanding the extent of past Arctic ice could help predict how the planet will respond to global warming

New research reveals that Earth's Northern Hemisphere is growing darker faster than the Southern Hemisphere is.

Earth Is Getting Dimmer—and the Northern Hemisphere Is Losing Brightness Faster Than Scientists Expected

New research challenges the idea that the hemispheres’ matching brightness is a fundamental property of the planet

The European Space Agency’s ExoMars Trace Gas Orbiter captured images of 3I/ATLAS on October 3.

A Rare Interstellar Comet Just Flew by Mars—Here Are the Photos Captured by an Orbiting Spacecraft

The images offer the closest view yet of comet 3I/ATLAS, famous for being only the third known interstellar object to pass through our solar system

Comet C/2025 A6 (Lemmon) moves closer to the sun, as captured on October 2.

Here’s How to See Two Comets and a Meteor Shower Light Up the Sky This Month

Skywatchers are anticipating prime viewing conditions for an annual showing of shooting stars and two comet flybys

The three missions launched on a SpaceX Falcon 9 rocket the morning of September 24.

‘Ultimate Cosmic Carpool’ Sends Three New Missions to Monitor Space Weather and the Protective Bubble Around Our Solar System

The spacecraft will map the boundaries of the heliosphere, study how Earth’s outer atmosphere reacts to solar activity and provide continuous monitoring of space weather

A coronal mass ejection erupts from the sun in 2013.

How Prepared Are We for a Rare and Powerful Solar Event?

A coronal mass ejection could knock out power and disrupt communication on Earth

A solar flare with the Earth for scale.

Solar Flares May Be Way Hotter Than Researchers Previously Thought

Scientists recalculated the temperature of solar flares using modern data and new models

The Hubble Space Telescope captured this image of 3I/ATLAS with its Wide Field Camera 3.

Telescopes Reveal Surprising Chemistry of a Rare Interstellar Object Passing Through Our Solar System

Called 3I/ATLAS, the object is only the third of its kind known to astronomers, and it’s likely been heading our way for billions of years, carrying pristine material from another star system

Colorful umbrellas protect beachgoers from the glaring sun on a day when most seemingly opted to stay somewhere cooler.

Get a Dose of Sun, Sand and Sea With These 20 Scenes From the Beach

These highlights from the Smithsonian Magazine Photo Contest are sure to remind you of everything you love about the shore

Researchers used a laser to superheat a sample of gold past its theoretical limit and directly measured its temperature.

Physicists Superheated Gold to Hotter Than the Sun’s Surface and Disproved a 40-Year-Old Idea

A thin piece of gold reached 33,740 degrees Fahrenheit, which is more than 14 times higher than its melting point, by being rapidly heated—and it didn’t melt

Concentric star trails glow behind a single dragon's blood tree, an otherworldly species native to Yemen's Socotra island.

Check Out Ten Spectacular Space Images From the Astronomy Photographer of the Year Contest

The annual competition for professional and amateur astrophotographers released its shortlisted images, which capture the beauty of the cosmos seen from Earth

The comet 3I/ATLAS moves against a backdrop of stars. The ATLAS survey telescope in Rio Hurtado, Chile, was the first to report that the object came from interstellar space.

A Rare Interstellar Object Is Blazing Through Our Solar System, Marking Only the Third Cosmic Visitor on Record

The comet follows just two other deep space objects documented by astronomers in 2017 and 2019

The sun’s corona on May 23, 2025, as imaged by the ASPIICS coronagraph aboard Proba-3. The hair-like structures appeared with the help of an image processing algorithm.

See the Beauty of an Artificial Solar Eclipse, Created With a First-of-Its-Kind, ‘Perfect’ Satellite Formation

Two satellites’ highly precise alignment allows scientists to study the sun’s outer atmosphere like never before

The Solar Orbiter has captured the first-ever views of the sun's south pole.

See the First-Ever Direct Images of the Sun’s South Pole, Captured by the Solar Orbiter Spacecraft

The spacecraft’s tilted orbit will allow scientists to investigate the mechanisms behind space weather that impact crucial human activity on Earth

A full moon on June 28, 2018, as seen from Manchester, England. The reddish glow is likely due to the 2018 Saddleworth Moor wildfires. 

Catch This Year’s Strawberry Moon Lighting Up the Sky on June 11

The last full moon before summer kicks off is one of the lowest of the year in the Northern Hemisphere

Page 2 of 14