The ability to instantaneously jump from one location in space to another clearly violates the laws of physics. Or does it? There are a few rules in the Universe that seem […]

Despite what you may have heard, they don’t suck anything in at all. Black holes are some of the strangest, most wondrous objects in all the Universe. With huge amounts of […]

When you emit gravitational waves, they have to pass through the Universe. But do they gravitate, too? When you travel through the Universe, it isn’t just a free ride through […]

We can go to deeper and deeper levels, finding more fundamental quantities as we do. But is there a truly fundamental quantity? What is the Universe, at a fundamental level, […]

There may be a fundamental reason why time travel, backwards, is impossible. We’ve all had the dream of traveling back in time. Whether there’s a wrong we want to right, […]

As the Event Horizon Telescope prepares to release its first results, we can expect not just one, but two black hole images. What does a black hole actually look like? For […]

In General Relativity, even space and time themselves aren’t what they seem. Gravity might have been the first fundamental force ever discovered, but in many ways, it remains the least-well understood. […]

Did the Universe begin at time t=0? Did space and time emerge from that? The Universe, today, is expanding and cooling, as the volume of the Universe increases while the number […]

What’s going on at the smallest and largest scales of all? Let’s look to the absolute limits of physics. Have you ever wondered what’s out there in the Universe, on the […]

In the search for fundamental truths in our Universe, one of the biggest questions, “are space and time continuous or discrete,” remains unanswered. Throughout the history of science, one of […]

In 2015, Ed Witten, the greatest living string theorist, wrote a piece on why. Here’s the version for everyone. It’s one of the most brilliant, controversial and unproven ideas in […]

As the new Star Wars movie, Solo, premieres, let’s look at the physics of how his most famous achievement might actually be possible. The Millennium Falcon’s greatest achievement, according to […]

It’s the first, most naive question you might think to ask. The solution is a lot more complicated than you imagine. According to a large amount of evidence, the overwhelming majority […]

Would there be only blackness past the event horizon? Or something more? Black holes are some of the most perplexing objects in the entire Universe. Objects so dense, where gravitation […]

There are plenty of questions we don’t know the answer to. With quantum gravity, they might be solved! This article is written by Sabine Hossenfelder. Sabine is a theoretical physicist specialized […]

Don’t believe in dark matter or dark energy? Your view of the Universe just got a lot more difficult. If you ask an astrophysicist what’s the greatest puzzle in the […]

Falling into a black hole is forever… but could a tether to the outside pull you back out? “Nobody ever did, or ever will, escape the consequences of his choices.” –Alfred A. […]

It’s the most fundamental fabric of the Universe itself. But how does it work? “‘Space-time’ — that hideous hybrid whose very hyphen looks phoney.” –Vladimir Nabokov When it comes to understanding the Universe, there […]

We see them change in wavelength, energy and in their electric and magnetic fields over time. So how do they experience it? “Everyone has his dream; I would like to […]