To ensure that the tissue structures of biological samples are easily recognizable under the electron microscope, they are treated with a staining agent. The standard staining agent for this is uranyl acetate. However, some laboratories are not allowed to use…

Solar system comets are often at their brightest as they draw close to the sun

Nearly everything in the universe is made of mysterious dark matter and dark energy, yet we can’t see either of them directly. Scientists are developing detectors so sensitive they can spot particle interactions that might occur once in years or even decades.…

They're called ghost particles for a reason. They're everywhere—trillions of them constantly stream through everything: our bodies, our planet, even the entire cosmos. These so-called neutrinos are elementary particles that are invisible, incredibly light, an…

Both NASA’s James Webb Space Telescope and Chandra X-ray Observatory caught these two galaxies in a close embrace.

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might behave slightly differently at extreme energies. By tracking ult…

The discovery that small stone arrow tips were treated with plant poison 60,000 years ago means that ancient African hunters were capable of complex thinking.

Experiments inside a fusion reactor in China have demonstrated a new way to circumvent one of the caps on the density of the superheated plasma swirling inside.

Fossilized bones and teeth dating to 773,000 years ago are providing a deeper understanding of the emergence of Homo sapiens.

Cold weather is vanishing—and with it, something vital inside the world’s crops. Scientists are uncovering how the loss of deep winter chill is quietly disrupting flowering, pest control, and even plant memory.

Meet the animals that turn heat, wind and fire into killing tools

"This was many times more energetic than any similar event and more than any known explosion powered by the collapse of a star."

: Synthetic cephalopod skin could be used in architecture and computer displays as well as background-matching subterfuge

One of the critical aspects of exoplanet habitability is the long-term stability of the stars they orbit.

Imagine a volcanic eruption so massive it could plunge the Earth into darkness, trigger widespread famine, and alter the planet’s climate for centuries.

Stone Age arrowheads found in South Africa showcase the knowledge and strategy of prehistoric hunter-gatherers, according to a new study.

NASA's Atmospheric Waves Experiment (AWE) discovered an unknown phenomenon from the International Space Station, 55 miles above Earth.

The galaxy cluster appears hotter and more mature than it should for its young age, challenging what we think we know about how these cities of galaxies form.

Solar physicists say they have found a key source of intense gamma rays unleashed when Earth's nearest star produces its most violent eruptions.

Windows are a curse and a blessing. They let light in but solar heat as well. A new process could reduce solar gain.

Perseverance rover found a rock on Mars named Phippsaksla with so much iron and nickel that it could be a meteorite.

A fascinating fossil discovery in West Texas has revealed a surprising new range for an ancient plant-eating dinosaur.

How does a star affect the makeup of its planets? And what does this mean for the habitability of distant worlds? Carnegie's Luke Bouma is exploring a new way to probe this critical question—using naturally occurring space weather stations that orbit at least…

A large-scale analysis of 117 mammal species found that preventing reproduction is associated with longer lifespans, suggesting a strong link between reproductive activity and life expectancy. Why do some animals live for decades while others survive only a f…

If the rollout happens on NASA’s current schedule, astronauts could be headed back to the Moon next month.