One parameter, alone, sets the dividing line between rocky planets, gas giants, brown dwarfs, stars, and much more. Here's why mass matters.

The distance ladder and the CMB give incompatible values for the expansion rate. A new study shows just how robust the Hubble tension is.

By looking at a giant, remarkable, edge-on protoplanetary system, astronomers have found a proto-protoplanet for the first time.

Human beings have now traveled farther from Earth than ever before with Artemis II's flyby of the lunar far side. Here's how it happened.

Mars was warmer and wetter long ago. If anything was alive there, what came next was either a tragedy or a masterclass in survival.

Known as the "past hypothesis" problem, the Universe's initially low entropy has long puzzled scientists. Now, cosmic inflation solves it.

As the world teeters on the brink of nuclear war, distant, advanced civilizations would never know it. Earth appears peaceful from far away.

As AI overwhelms the web, we will need a way to distinguish people from machines.

The 1st generation of stars formed, lived, and died very early on. But 2nd generation stars could still persist today. Did we just find one?

As humanity journeys to the Moon for the first time since 1972, can we rediscover our shared responsibilities: to the world and each other?

As light travels across the Universe, it's subject to cosmic expansion, changing fields, and relative motion. How about gravitational waves?

Neuroscientist David Linden sheds light on the biology behind phenomena that medicine has long struggled to explain, from voodoo death and broken heart syndrome to the placebo effect, and why grief shows up in autopsy results

This 1524 map of the Aztec capital was a window into an exotic otherworld — and largely a fiction.

The ozone hole was going to destroy life as we know it, but an unprecedented global effort fixed the problem.

Cognitive flexibility, opportunistic survival, and social cooperation have allowed rats to thrive in conditions that wipe out other species.

Instead of hauling heavy building materials across space, future astronauts may grow fungal shelters from spores, waste, and local regolith.

A broken laptop hinge revealed a broader shift in how modern products are designed, sold, and owned

AI is unlocking unprecedented capabilities — and exposing new vulnerabilities just as quickly.

We’ve populated low-Earth orbit with satellites in record time — now we have to figure out how to keep it safe.

When America lost access to German dyes, the crisis revealed a startling truth: color was chemical, tactical, and essential to warfare.