Astronomy

Jupiter's moon Ganymede is the largest moon in the solar system and is even wider than the planet Mercury.

An Ancient Asteroid Smashed Into Jupiter's Moon Ganymede and Tipped It Over, Study Finds

The cataclysmic impactor was 20 times the size of the rock that wiped out the dinosaurs on Earth

Catalina Sky Survey's images identifying Asteroid 2024 RW1.

An Asteroid Hit Earth's Atmosphere Today—Here's Why Astronomers Say That's a Good Thing

Asteroid 2024 RW1 was discovered early this morning, marking the ninth time in history that humans have detected an approaching space rock before its impact

The Milky Way lights up the sky over Cathedral Rock in the Coconino National Forest in Sedona, Arizona.

How to See the Milky Way This Weekend

Late August is a great time to observe the dazzling core of our galaxy, and with the upcoming new moon, viewing conditions should be ideal—as long as you're in a very dark area

The remains of the observatory at the ancient Egyptian city of Kafr El-Sheikh

This Massive Egyptian Observatory Is Unlocking Celestial Secrets of an Ancient Culture

The 2,500-year-old building with roots in both science and religion helped track the movement of the sun and stars

An artist's rendition of a magma ocean on a volcanic planet. Scientists have theorized that our moon was covered in a magma ocean for millions of years after it formed.

Our Moon Was Likely Covered in a Magma Ocean Long Ago, and New Data From India's Lunar Rover Supports That Theory

Soil composition measurements from the Chandrayaan-3 mission reveal white rock called ferroan anorthosite, which would have floated to the surface in an ocean of magma

Boeing's Starliner spacecraft is seen docked at the ISS. After helium leaks and thruster issues, the craft will make an uncrewed return to Earth.

NASA's Starliner Astronauts Will Return on SpaceX Craft in February, Turning an Eight-Day Mission Into Eight Months on the ISS

Boeing’s Starliner spacecraft no longer meets safety standards after experiencing technical issues in June, and it will return to Earth uncrewed, the space agency announced

A scan of a color copy of the original computer printout bearing the Wow! signal, taken several years after the signal's 1977 arrival.

Mysterious 'Wow!' Radio Signal Might Finally Have an Explanation—and No, It's Not Aliens

The infamous signal recorded in 1977 might have been a laser-like beam of radiation from a hydrogen cloud energized by a powerful, magnetic star, preliminary research suggests

A full moon rises over the Vasquez Rocks in California.

A Rare 'Super Blue Moon' Will Be Visible Monday Night: What Does That Mean?

Tonight’s full moon will be bigger and brighter than usual, and it’s the third of four full moons this summer

An artist's illustration of the WISE spacecraft in orbit around Earth. The mission was renamed NEOWISE in 2013 to reflect a new focus on finding near-Earth objects.

NASA Retires Orbiting Telescope That Charted Asteroids for Over a Decade

NEOWISE, which looked for potentially hazardous objects in the solar system, received its last command on Thursday and will burn up when it re-enters Earth's atmosphere

The tinfoil-covered vial at right holds about four grams of an asteroid brought to Earth from deep space. It may also hold the key to how life began here. The vial at left holds ground-up quartz that will act as a control in chemical investigations.

Inside Scientists’ Quest to Find the Secrets of Life in Four Grams of Asteroid Dust

NASA researchers are scrutinizing rocks and dirt brought to Earth from the asteroid Bennu

The Perseids occur when Earth passes through the debris field of the comet 109P/Swift-Tuttle.

How to Watch the Perseids, the 'Best Meteor Shower of the Year'

The annual celestial event is one of the year's most anticipated, and it will peak from August 11 to 12

Brahe's mansion, Uraniborg, was located on an island in Sweden. His basement laboratory is represented by the bottom left room in this drawing.

Was This Renaissance Alchemist Ahead of His Time?

New research suggests that Tycho Brahe isolated tungsten nearly 200 years before the metal was identified as an element

A team of archaeoastronomers suggests the Pyramid of the Moon in Teotihuacán, Mexico, may have been constructed to align with the movement of the sun.

Ancient Mesoamerican 'Pyramid of the Moon' May Align With Summer and Winter Solstices

New research suggests the monument in Teotihuacán, along with the larger Pyramid of the Sun, were designed based on astronomical movements

Meteors fly above Sydney, Australia, on July 28, 2022. The Southern Delta Aquariids will be easiest to see from the Southern Hemisphere, but will still be visible at southern latitudes in the United States.

How to Watch the Southern Delta Aquariids Meteor Shower

Though not as prolific as the Perseids, this annual spectacle is 'scientifically interesting' because its comet of origin remains a mystery

Astronomers released 25 new images to celebrate the 25th anniversary of the Chandra X-Ray Observatory's launch.

See 25 Stunning Images of the Cosmos From the Chandra X-Ray Observatory as It Celebrates 25 Years in Space

Chandra, the world’s most powerful X-ray telescope, has been peering at black holes, stellar explosions and dark energy for a quarter-century

Apollo 11 astronauts watched the Earth rise above the moon’s horizon on July 20, 1969.

Apollo Astronauts Left American Flags, Boots and Even Poop on the Moon. Here's Why These Artifacts Matter

Fifty-five years after the first human lunar landing, scholars and experts are looking to preserve the past as more nations and companies undertake moon missions

An artist's rendition of the eight planets in our solar system. The planets are depicted closer together than they really are.

Astronomers Propose New Criteria to Classify Planets, but Pluto Still Doesn't Make the Cut

The new definition would define planets based on mass, rather than more ambiguous shape and size characteristics

The Penguin and the Egg are about 100,000 light-years apart.

James Webb's Newest Image Shows a Giant Penguin and an Egg

NASA released the dazzling portrait to help celebrate the two-year anniversary of the release of Webb's first images

An artist’s depiction of HD 189733b encountering an eruption of x-rays from the star it’s orbiting

This Nearby Exoplanet Is Hot, Dangerous—and Smells Like Rotten Eggs

Located about 64 light-years away from Earth, the world is the first place astronomers have detected hydrogen sulfide outside our solar system

Created more than 2,000 years ago, the Antikythera mechanism tracked the movements of celestial bodies.

Gravitational Wave Scientists Are Unraveling the Mysteries of the World's Oldest Analog Computer

A new study challenges a core assumption about the Antikythera mechanism, a 2,000-year-old device that inspired the latest "Indiana Jones" film

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