How to Live with Mystery in a Culture Obsessed with Certainty and Definitive Answers. By Maria Popova.

Over the past century, Einstein's predictions have been verified – except one. Only gravitational waves remain. By Dan Falk.

The contest between gravity and quantum physics takes a new turn. By Corey S. Powell.

Researchers affirmed once again that quantum mechanics, as strange as it may seem, works in every way we can test it. By Lawrence M. Krauss.

Light given off by hydrogen shortly after the big bang has left some unexplained bright patches in space. Are they evidence of bumping into another universe?

To celebrate Halloween, Nature brings you the undead results that physicists can neither prove—nor lay to rest.

“Even today, there is a small cadre of Hollow Earth believers who are fighting valiantly to validate their ideas through books, websites, meetings and some extremely ambitious travel plans...” By Eric Grundhauser.

Earth came early to the party in the evolving universe. According to a new theoretical study, when our solar system was born 4.6 billion years ago only eight percent of the potentially habitable planets that will ever form in the universe existed.

Although time machines remain a sci-fi fantasy, the vast distances of the universe make it possible to peer back in time and see things as they appeared billions of years ago.

Of all the ways the Universe might die, vacuum decay is the most efficient.

Is looking for radio transmissions in space like claiming the lack of smoke signals means there are no modern humans? “[W]hat Fermi immediately realized was that the aliens have had more than enough time to pepper the Galaxy with their presence. But looking around, he didn’t see any clear indication that they’re out and about. This prompted Fermi to ask what was (to him) an obvious question: ‘where is everybody?’”

Dark Matter — the unseen 80 percent of the universe’s mass—doesn’t emit, absorb or reflect light. Astronomers know it exists only because it interacts with our slice of the ordinary universe through gravity. Hence the hunt for this missing mass has focused on so-called WIMPs—Weakly Interacting Massive Particles—which interact with each other as infrequently as they interact with normal matter.

There’s something out there so massive that it’s pulling on every object within hundreds of millions of light years, we call it the Great Attractor and we’re flying towards this unseen object at 14 million miles an hour.

A roundup of some of the super-elaborate—and super-expensive—detectors physicists use to study neutrinos.

People in the Middle Ages asked what was the moon made of? How far away was it? Could it make my child vindictive? Here is what they found out.

Astronomers have produced the best constraint ever of the gravitational constant measured outside of our Solar System.

Astronomers have announced the discovery of a truly monstrous structure consisting of a ring of galaxies around 5 billion light-years across — and it defies cosmological theory.

If it is clear tonight, step outside and marvel at the full moon. Its heavy, illuminated orb will trace a path right across the sky from horizon to horizon during the twilight and nighttime hours. It will be shining in the reflected light of the Sun, as normal, and will appear yellow/white, as normal, yet we call it a blue moon because, well … here’s where the story gets interesting.

In a new blow for the futuristic “supersymmetry” theory of the universe’s basic anatomy, experts reported fresh evidence Monday of subatomic activity consistent with the mainstream Standard Model of particle physics.

In homage to the 60th anniversary of the world’s first atomic clock, it’s time to ask what time actually is and whether it even exists.