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Solar System

On Thursday, Artemis 2 astronauts Reid Wiseman, Victor Glover, Christina Koch and Jeremy Hansen gave their first press conference since splashing down. Here, Hansen holds Rise, the crew’s mascot and zero-gravity indicator, which visually demonstrated when they had entered space.

After Rounding the Moon, Artemis 2 Astronauts Reflect on the Magnitude of the Experience: ‘We as Countries and as Humans Did This’

In their first press conference since returning from space, the four-person crew described feeling small but united with people on Earth and said the mission was an achievement by all of humanity

The Parker Solar Probe model displayed in the James S. McDonnell Space Hangar at the National Air and Space Museum's Steven F. Udvar-Hazy Center

The James Webb Space Telescope and the Parker Solar Probe Changed How We See the Universe. Now, Their Models Have Found a Home at the Smithsonian

The National Air and Space Museum’s Virginia location now displays the objects which represent critical leaps forward in technology and exploration by NASA

From the perspective of the Orion spacecraft, seen at left, the moon eclipsed the sun on April 6.

What Lies Beyond Artemis 2? These Other Missions Are Setting Their Sights on the Moon This Year—and on a Future With Humans in Space

As the historic lunar flyby comes to a close, space companies and nations around the world are also shooting for the moon. Upcoming landings aim to change the landscape of space exploration

Earth, partially illuminated, appears over the moon’s horizon at 6:41 p.m. Eastern time on Monday—just three minutes before the Artemis 2 astronauts reached the far side of the moon, initiating a communications blackout with NASA’s teams on the ground.

See the Awe-Inspiring New Photos of the Moon and Earth Sent Back From the Artemis 2 Mission

The astronauts are on their way home after looping around the moon on a historic flyby. Here are the dazzling images they captured

A violent, swirling storm on Jupiter captured by NASA's Juno spacecraft

Lightning Strikes on Jupiter Are 100 Times as Powerful as Those on Earth, a New Study Suggests

Scientists finally have a clearer picture of the gas giant’s intense storms

An artist's concept of comet 41P as it approached the sun, turning some of its ice into gaseous jets

In a First, an Astronomer May Have Witnessed a Comet Stop Its Spin—Then Reverse Its Rotation

Archival images snapped by the Hubble Space Telescope revealed the unusual event

During a training exercise in Houston in January 2025, the Artemis 2 crew practiced configuring the Orion spacecraft for orbit and its return to Earth.

The Revolution in Moon Exploration

It’s Almost ‘All Systems Go’ for Artemis 2 to Take the Next Giant Leap Toward Stepping on the Moon Again

Scheduled to launch this week, NASA’s Artemis 2 is part of the bold 21st-century vision for returning astronauts to the lunar surface

Illustration of L98-59d (lower left) orbiting its host star, a red dwarf

Scientists May Have Discovered a New Type of Planet Beyond the Solar System. The Catch? It Smells Like Rotten Eggs

L98-59d seems to be a molten planet with an atmosphere full of hydrogen sulfide

An artist’s illustration of the exoplanet HD 219134 b, a rocky world about 21 light-years from Earth. This scorching planet, which orbits extremely close to its host star, might have a partially molten surface and volcanoes.

Alien Life Could Look Nothing Like What We Expect. Here’s How Microbes Beyond Earth Might Live Without Liquid Water

Like the lead character of “Project Hail Mary,” some scientists are proposing ways that life might exist beyond a star’s “habitable zone,” often considered the gold standard of potential livability

Saturn's rings are surprisingly young

A Smashing New Proposal About Saturn’s History Might Explain Its Iconic Rings and Some of Its Odd Moons

A crash involving the planet’s largest moon, Titan, and a hypothetical moon may have triggered a curious sequence of events

An artistic rendering of the 'inside out' solar system

Astronomers Discover an Exoplanet in the Wrong Place, Hinting at a Planetary System That Was Born ‘Inside Out’

A rocky planet was found orbiting its host star in an unusual location

Earth's core is mostly made of the metals iron and nickel, but it also contains lighter elements like hydrogen, oxygen and silicon. 

Earth’s Core Might Hold Dozens of Oceans Worth of Hydrogen, Hinting at the Origins of the Planet’s Vast Water Supply

Scientists have long debated whether most of Earth’s vital liquid was delivered via icy comets or was homemade

The updated measurements won't take away Jupiter's status as the solar system's biggest planet.

Scientists Say That Jupiter—the Solar System’s Largest Planet—Might Be Slightly Smaller Than Previously Thought

Updated measurements from NASA’s Juno spacecraft could help researchers better understand the planet’s mysterious interior, as well as other gas giants

A supermoon rises over Washington, D.C., on December 3, 2017.

The Year’s First Bright Supermoon and the Colorful Quadrantid Meteor Shower Coincide This Weekend

The dual celestial events will ring in the new year, although the luminous “wolf” supermoon may hamper skywatchers’ view of the shooting stars

Look up throughout the year to catch a wide array of astronomical sights.

Don’t Miss These Ten Celestial Events in 2026, From Aligned Planets to a Total Solar Eclipse

The upcoming year will offer a blood-red moon, spectacular meteor showers and the first glimpse of the sun’s corona since April 2024

In 2025, researchers watched an interstellar comet, learned about human origins and traced the spread of measles.

The Ten Most Significant Science Stories of 2025, From Medical Breakthroughs to an Interstellar Visitor

All year long, these moments captivated the public, demonstrated dangerous trends, and pushed research and innovation forward

David Rankin, operations manager at the Catalina Sky Survey, keeps tabs on space rocks in search of new and potentially hazardous asteroids.

From a Remote Observatory, He’s Defending Our Planet. Get a Glimpse Inside the Life of a Doomsday Asteroid Hunter

David Rankin of the Catalina Sky Survey in Arizona spends nights scanning the solar system for potentially catastrophic space rocks. Here’s what he has to say about that “high consequence” work, an interstellar comet and living with uncertainty

NASA’s Lucy spacecraft, which is investigating a group of asteroids that share Jupiter's orbit around the sun, snapped this image on September 16 as 3I/ATLAS approached Mars. 

Interstellar Comet 3I/ATLAS Is About to Make Its Closest Approach to Earth. Here’s How to View It With Binoculars or a Telescope

On December 19, avid skywatchers can catch a glimpse of the mysterious visitor through powerful binoculars or a telescope when it’s around 170 million miles from our home planet

Time passes by faster on Mars than on Earth.

How to Keep Time on Mars: Clocks on the Red Planet Would Tick a Bit Differently Than Those on Earth

On average, Martian time ticks roughly 477 millionths of a second faster than terrestrial clocks per Earth day. But the Red Planet’s elongated orbit causes the time difference to vary as Mars travels around the sun

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The Astronomical Problem of Space Junk

Chunks of satellites and pieces of debris falling from space are causing trouble down here on Earth

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