The impact risk associated with asteroid 2024 YR4 rose and fell in the months following its discovery. The red dots represent the possible locations of the space rock on December 22, 2032, while the yellow dot represents its most likely location.

The ‘Riskiest Asteroid Ever’ Is No Longer a Threat as Impact Probability Drops to Near Zero

As astronomers predicted, asteroid 2024 YR4 is not expected to hit Earth in 2032. This week, NASA gave the “all clear”

Discovery images of asteroid 2024 YR4, which is highlighted in green

Chance of Asteroid Strike in 2032 Drops Sharply After Record-Setting Rise. Here’s Why It Keeps Changing

NASA announced that asteroid 2024 YR4 now has a 0.28 percent chance of hitting Earth in 2032, but that number is expected to continue shifting with further observations

The Schrödinger impact crater near the lunar south pole features two long canyons close by: Vallis Schrödinger and Vallis Planck.

Two of the Moon’s Grand Canyons Were Formed in Just Ten Violent Minutes, New Study Suggests

Scientists say Vallis Schrödinger and Vallis Planck—dramatic trenches near the lunar south pole—were carved in a blast that unleashed 130 times the amount of energy in Earth’s global nuclear weapons inventory

An artist's impression of a generic asteroid.

Astronomers Raise Odds of Asteroid Impact in 2032 to 2.3 Percent—Here’s Why You Shouldn’t Panic

The chance of a newly discovered space rock hitting Earth in about eight years was predicted at 1.6 percent last week. Though that number’s rising, experts say further research could bring it to zero

The Tesla Roadster and the mannequin "Starman" on the SpaceX Falcon Heavy upper stage, with Earth in background.

An Amateur Astronomer Seemingly Spotted a New Asteroid. It Turned Out to Be a Tesla in Space

The car, launched in 2018 on a SpaceX rocket’s upper stage, is one of many human-made objects in deep space that could potentially be mistaken for natural celestial bodies

A scanning electron microscope image shows sodium carbonates in a sample from the asteroid Bennu. Each needle is less than one micrometer wide by five to ten micrometers in length—for comparison, a human hair is about 100 micrometers wide.

Scientists Discover Traces of Salt Water and Building Blocks of Life in NASA’s Samples From the Asteroid Bennu

Two new papers describe hints to a brine-filled environment on the 4.5-billion-year-old space rock and the presence of amino acids, offering clues to how early Earth got its ingredients for life

The Quadrantids only last for about six hours, but they're known for producing fireballs, or bright, fiery streaks that persist longer than average meteors.

How to Watch the Quadrantid Meteor Shower, an Intense Spectacle With a Short but Strong Peak

The skyward show will produce many shooting stars from the evening of January 2 into the early morning hours of January 3—here’s how to make the most of the fleeting celestial event

An artist's illustration shows the James Webb Space Telescope peering out into the solar system toward the asteroid belt.

Astronomers Detect the Smallest Main Belt Asteroids Ever Found by Repurposing a Technique for Exoplanet Discovery

An unusual approach to spotting tiny asteroids uses James Webb Space Telescope data in a boost for planetary defense research

This image of the Geminid meteor shower, as seen from China, earned first place in the 2021 astrophotography contest by the International Astronomical Union Office of Astronomy Education.

How to Watch the Geminid Meteor Shower This Weekend

The peak of this popular annual meteor shower risks being washed out by an almost full moon this year—but stargazers can still spot shooting stars if they follow the right tips

Smithsonian magazine’s top science titles this year.

The Ten Best Science Books of 2024

From a deep dive on a fatal space shuttle disaster to a study of a dozen iconic trees, these are our favorite titles this year

A stock illustration of an asteroid near Earth. Astronomers believe our "mini-moon" originated from the Arjuna asteroid belt.

Earth Bids Goodbye to Its ‘Mini-Moon’ as Astronomers Investigate Where Our Planet’s Asteroid Companion Came From

Preliminary research suggests asteroid 2024 PT5, which stuck around Earth for almost two months, has lunar origins

A rock layer showing the S2 impact tsunami bed with chunks of ripped-up seafloor

A Giant Meteorite Ripped Up the Seafloor and Boiled Earth’s Oceans 3.26 Billion Years Ago. Then, Life Blossomed in Its Wake

Geologists suggest the catastrophic impact of “S2” delivered key nutrients to the oceans, prompting microorganisms to thrive

The Perseid meteor shower over Inner Mongolia, China, on August 14, 2023. When a meteor falls to the ground, it's called a meteorite.

Astronomers Uncover the Origin of Most of Earth’s Meteorites, Shedding Light on Our Solar System’s Past

Prior to the new research, scientists had traced the source of just 6 percent of the known meteorites that fell on our planet

A worker of the fungus-farming ant species Mycetophylax asper, collected in Santa Catarina, Brazil, in 2014, on its fungus garden

Ants Farmed Fungi in the Wake of Dinosaurs’ Demise 66 Million Years Ago

A new study from Smithsonian scientists analyzes ant and fungus species, and uncovers the origins of their close partnership

An illustration of an asteroid and the moon orbiting Earth.

Earth Is Getting a New ‘Mini Moon’ for the Next Two Months, Astronomers Say

A roughly 33-foot-long asteroid called 2024 PT5 will chart a horseshoe-like path around our planet

An illustration of Earth with a ring.

Did Earth Once Have a Ring Like Saturn? Geologists Find Evidence for a Halo of Orbiting Space Rocks 466 Million Years Ago

A ring could explain a mysterious arrangement of impact craters near the equator and might even have caused an ice age, according to a new study

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

When an asteroid struck Earth about 66 million years ago, it wiped out some 80 percent of the planet's animals, including all of the non-avian dinosuars.

Asteroid That Ended the Dinosaurs Came From Beyond Jupiter, Study Finds

Metal isotopes delivered to Earth by the asteroid reveal it’s consistent with space rocks formed in the outer solar system

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

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