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A researcher stands inside the crystal-filled cave known as the Pulpí Geode — the largest geode on Earth.

The World's Largest Geode Formed When the Mediterranean Sea Disappeared, New Study Reveals

By Brandon Specktor

The Pulpí Geode, in southern Spain, is the largest geode in the world. For the first time, scientists think they know how it was made.

NASA astronauts Christina Koch and Jessica Meir complete the first-ever "all-women spacewalk."

NASA Astronauts Make History with 1st All-Female Spacewalk

By Chelsea Gohd

Today (Oct. 18), NASA astronauts Christina Koch and Jessica Meir embarked on the first spacewalk in history to be completed by a team of all women.

An illustration of the lungs.

Fat Can Build Up in Your Lungs

By Rachael Rettner

Fat can accumulate in some insidious places in the body, including your lungs, a new study finds.

A photo of the found Kaga vessel

Long-Lost WWII Ship Found at the Bottom of the Pacific Ocean

By Nicoletta Lanese

The Kaga sank during the historic Battle of Midway, along with six other vessels.

Garlock fault from above

This Quiet Fault in Southern California Hadn't Moved in 500 Years. Now It's Slipping.

By Nicoletta Lanese

Earthquakes that shook Southern California in July set a nearby fault in motion.

NASA astronaut Christina Koch (left) poses for a portrait with fellow Expedition 61 Flight Engineer Jessica Meir of NASA who is inside a U.S. spacesuit for a fit check for a spacewalk on Oct. 18, 2019. It will be the first all-female spacewalk in history.

The 1st All-Female Spacewalk Happening Today. Here's How to Watch It Live

By Mike Wall

NASA astronauts Christina Koch and Jessica Meir are scheduled to begin the first-ever all-female spacewalk today (Oct. 18) at around 7:50 a.m. EDT (1150 GMT). Watch it live at Space.com.

An artist's depiction of simulations used in the research.

The Milky Way Stole Its Cosmic Neighbors from Another Galaxy

By Elizabeth Howell

Our home galaxy stole several dwarf galaxies that used to belong to the Large Magellanic Cloud (LMC), a galaxy near the Milky Way.

Greenland ice sheet.

What Is the Cryosphere?

By Mark Serreze

The cryosphere is critical to Earth and its inhabitants, but it is vanishing as the planet warms.

A doctor holding a lung X-ray.

Vaping Outbreak Death Toll Reaches 33

By Rachael Rettner

Nearly three dozen people have died from vaping-related lung illnesses as the nationwide outbreak that continues to grow.

A close-up view of the wingtip ESM sensors, or electronic support measures, on a U.S. Navy E-6A Mercury aircraft. To create the E-6B, Boeing modified the E-6A, adding various specialized equipment.

This 'Doomsday' Plane Was Designed to Survive a Nuclear Attack. A Bird Just Took It Down.

By Jeanna Bryner

This Navy craft is meant to communicate with nuclear forces in the event of a nuclear war. And a bird strike just grounded it.

ebola virus

Japan Just Imported Ebola to Prep for Possible Olympic Outbreak

By Nicoletta Lanese

Japan imported Ebola and other lethal viruses to prepare diagnostic test kits for the 2020 Olympics.

Red represents record-warmest temperatures. That's a lot of red.

Scorching Hot Take: September Was North America's Warmest Ever

By Mindy Weisberger

September tied the record for the warmest average global temperatures during that month, according to a new NOAA report.

Virgin Galactic's Sir Richard Branson models the new line of "spacewear" created in partnership with Under Armour.

Virgin Galactic Unveils New Line of Under Armour 'Spacewear' for Space Tourists

By Tariq Malik

Virgin Galactic and partner Under Armour unveiled a new line of "spacewear" spacesuits for future passengers on SpaceShipTwo.

The reptile's long tail is visible, but most of the crocodile's body is hidden under the bulk of the elephant that crushed it to death.

Dead Elephant Found Lying on Top of a Squashed Crocodile. What Happened?

By Mindy Weisberger

An elephant's seemingly final act after it was attacked by a crocodile was to collapse on top of the reptile, crushing the would-be predator.

Fossilized trilobites in a queue.

Ancient 'Cockroaches of the Sea' Fossilized While Playing 'Follow the Leader'

By Stephanie Pappas

Trilobites fossilized in Morocco seem to have been buried by a storm as they marched in an orderly queue.

A satellite image of the Bogoslof Volcano shows volcanic clouds after a 2017 eruption.

Underwater Volcano Creates Bubbles More Than a Quarter-Mile Across

By Yasemin Saplakoglu

In the early 20th century, sailors near Alaska reported seeing black bubbles seeming to boil out from the sea. They weren't wrong.

Artist impression of W2246-0526, the most luminous known galaxy, and three companion galaxies.

The 15 Weirdest Galaxies in Our Universe

By Stephanie Pappas

Capuchin monkey

Game Over: These Monkeys Just Crushed Humans on a Computer Game

By Nicoletta Lanese

While playing a game, monkeys switched strategies each round, while humans stuck to a set of inefficient rules.

Asteroid Breaking Apart

An Asteroid-Smashing Star Ground a Giant Rock to Bits and Covered Itself in the Remains

By Rafi Letzter

Good news for scientists. Bad news for any asteroid dwellers.

A man's tongue was missing "papillae," or the small bumps on the tongue that often contain taste buds (A). After treatment, the man's tongue returned to normal (B).

Why Did This Man's Taste Buds Disappear?

By Rachael Rettner

A man's missing taste buds would turn out to be a sign of an underlying blood condition.