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How NASA’s Curiosity Rover Weighed a Mountain on Mars

We Tried Five Polar-Weather Experiments. Here’s What Happened.

High Ceilings and a Lovely View: Denisova Cave Was Home to a Lost Branch of Humanity

A Closer Look at the Polar Vortex’s Dangerously Cold Winds

Seeking Superpowers in the Axolotl Genome

Remains of Explorer Who First Rounded Australia Found in UK

Don’t Kiss Your Pet Hedgehogs, Health Officials Warn

A Sharper Picture of Ultima Thule From NASA’s New Horizons

‘This Could Be the End’ for NASA’s Mars Opportunity Rover

How Long Is a Day on Saturn?

Older, right-leaning Twitter users spread the most fake news in 2016, study finds

And You Thought the Platypus Was Odd

The Doomsday Clock is stuck at 2 minutes to ‘midnight,’ the symbolic hour of the apocalypse

The shutdown could soon block telescopes’ view of the heavens

During the Lunar Eclipse, Something Slammed Into the Moon

‘The Garden of Eden is no more’: David Attenborough issues climate-change warning at Davos

3 Newborn Endangered Right Whales Seen After Year With No Births

Where Sloths Find These Branches, Their Family Trees Expand

How Ants Get a Taste for the Trail

Oceans Are Getting Louder, Posing Potential Threats to Marine Life

How Ants Sniff Out the Right Path

Coming Soon to a Police Station Near You: The DNA ‘Magic Box’

Pictures From the Lunar Eclipse and Supermoon

How to Watch the Lunar Eclipse and Supermoon on Sunday Night

These Species Were Said to Be Extinct. Really, They Were Just Hard to Find.

Romeo the Frog Finds His Juliet. Their Courtship May Save a Species.

What Happened to Earth’s Ancient Craters? Scientists Seek Clues on the Moon’s Pocked Surface

Orca Calf Offers Hope for a Fading Group in the Pacific Northwest

Experts warned this floating garbage collector wouldn’t work. The ocean proved them right.

The North Pole is moving, and the shutdown means we aren’t keeping up

Watch These Stink Bugs Hatch in Unison

Keep Your Crop Circles, Iowa: This Huge Ice Disk in a Maine River Is Churning Up Theories

When Fungi Fight Back

Giant Ice Disk Spins in Maine River

North Korea’s Less-Known Military Threat: Biological Weapons

Rise of the Golden Jackal

Lab Severs Ties With James Watson, Citing ‘Unsubstantiated and Reckless’ Remarks

Memorial Sloan Kettering Curbs Executives’ Ties to Industry After Conflict-of-Interest Scandals

Clean, Abundant Energy: Fusion Dreams Never End

Scientists had never seen anything like this supernova. Could it be a newborn black hole?

Broadcasting from Deep Space, a Mysterious Series of Radio Signals

Traditional Masculinity Can Hurt Boys, Say New A.P.A. Guidelines

How your at-home DNA test results could solve cold cases

Do Floppy-Eared Dogs Look Friendlier? The T.S.A. Thinks So

A Snail Called George, Believed to Be the Last of His Species, Dies

More Trouble for the Hubble Telescope as a Primary Camera Malfunctions

A Woman’s Work Was Sometimes Blue

The Hubble Space Telescope has a glitch -- again

Scientists just got closer to solving one of astronomy’s biggest mysteries

As shutdown continues, so does damage to U.S. science