Most of the footprints are elongated and made by bipeds. The best-preserved ones bear traces of at least four toes.

The National Oceanic and Atmospheric Administration’s annual Arctic report card shows how rapidly and profoundly climate change is warming and altering the region.

The 20th anniversary of the annual report tracks how sea ice, snow cover and many other vital signs of the Arctic have changed, and the impact that’s having on people and wildlife.

"This was an absolute surprise. It's extremely different from what we expected."

The direction, distance and motion of the comet through the sky during its closest approach could have made it seem like it was hovering over Bethlehem when Jesus was said to have been born.

The closer to Earth a satellite flies, the clearer a picture it can take of the surface. But low-flying satellites also have to deal with atmospheric drag.

Oxygen tank strapped to his back, Michael del Rosario moves his fins delicately as he glides along an underwater nursery just off the Dominican Republic coast, proudly showing off the “coral babies” growing on metal structures that look like large spiders. The conservationist enthusiastically points a finger to trace around the largest corals, just starting to reveal their vibrant colors. Del Rosario helped plant these tiny animals in the nursery after they were conceived in an assisted reprod

Membraneless organelles, also called biomolecular condensates, are changing how scientists think about protein chemistry, various diseases and even the origin of life.

December's faint Ursid meteor shower returns under dark skies, offering a small chance of unexpected activity.

Assuming Google does manage to launch a prototype in 2027, will it simply be a high-stakes technical experiment – or the dawning of a new era?

Carbon dioxide emissions trap heat in the atmosphere, warming the planet. Too much CO2 can disrupt the climate and oceans.

Twins are pretty rare, accounting for just 3% of births in the US these days. But new research shows that for primates 60 million years ago, giving birth to twins was the norm.

On Episode 189 of This Week In Space, Rod Pyle and Tariq Malik talk with their favorite Newspace Buccaneer, Jeffrey Manber.

Dark stars are not exactly stars, and they are certainly not dark.

The Geminid meteor shower occurs as Earth passes through the debris from asteroid (3200) Phaethon

The annual Geminid meteor shower is set to peak this weekend, offering what is often one of the year's best and most reliable displays of shooting stars.

Like a mood ring, clothing could let future space travelers know when they've been exposed to unsafe levels of radiation.

"The natural question that comes up is: how many more space telescopes will be affected when all these constellations are launched?"

Hawaiian stargazers got a particularly special treat recently.

A new machine learning model explores the boundary between biological and nonbiological chemistry.

With climate change steadily dismantling the icy habitat essential to their existence, new research suggests polar bears are rapidly rewiring their own genetics in a bid to survive

"Archaeologists did not expect to find such well-preserved structures in such a harsh setting," geologist Yves Fouquet said.

Super-Earth TOI-561b is about 40 times closer to its host star than Mercury is to the sun.

The Hjortspring boat carried warriors on an attempted attack of a Danish island over 2,000 years ago. Archaeologists have new clues about where these raiders came from.

"We did the simplest thing that could be done — we just mapped them and pieced them together."

Astronomers have found the strongest evidence yet of an atmosphere around a rocky exoplanet.

Interbreeding across species lines is one way helpful genes can spread into a bird population.

Researchers recently discovered an extremely small frog species in Brazil

By Will Dunham Dec 10 (Reuters) - Scientists have discovered the oldest-known evidence of fire-making by prehistoric humans in the English county of Suffolk - a hearth apparently made by Neanderthals

NASA has lost contact with a spacecraft that has orbited Mars for more than a decade. Maven abruptly stopped communicating to ground stations over the weekend. NASA said this week that it was working fine before it went behind the red planet.