The universe feels stable. Predictable. Constant. Unchanging. But what if it isn’t? Some scientists believe that everything ...

Modern cosmology assumes dark matter exists. But what makes us so certain that dark matter is the answer—and what if we're wrong?

"I think it's natural to take a break and wonder whether we are fundamentally thinking about this in the wrong way." When you purchase through links on our site, we may earn an affiliate commission.

The Big Bang is often described as the explosive birth of the universe—a singular moment when space, time and matter sprang into existence. But what if this was not the beginning at all? What if our ...

The first set of results from a pioneering cosmic-mapping project hints that the repulsive force known as dark energy has changed over 11 billion years, which would alter ideas about how the Universe ...

Our universe appears flat—but this observation still leaves plenty of options for its true shape. In fact, our cosmos could ...

Imagine drifting through space in a place so empty that you wouldn’t see a single star, planet, or galaxy in any direction. This is the Boötes Void, one of the largest known empty regions in the ...

UC Santa Cruz physicist Stefano Profumo has put forward two imaginative but scientifically grounded theories that may help solve one of the biggest mysteries in physics: the origin of dark matter. In ...

When you bake a loaf of bread or a batch of muffins, you put the dough into a pan. As the dough bakes in the oven, it expands into the baking pan. Any chocolate chips or blueberries in the muffin ...

Here’s the story we like to tell about the beginning of the universe. Space is expanding evenly everywhere, but if you rewind that expansion you find that all of space was once compacted in an ...