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Thermodynamics
When the Universe expands, photons redshift to longer wavelengths and lower energies. So where does that energy go? Imagine the ultimate version of a toy Universe: it’s expanding, it’s full of […]
When two black holes merge together, about 5% of their mass gets lost. Where does that information go? Do merging black holes lose information? They absolutely must, according to General […]
Despite what Hawking told you, it really isn’t about particle-antiparticle pairs at all. Nothing in the Universe lives forever. All the stars that will ever form will someday burn out; distant […]
We speak about it, argue over it, and even fight wars for it. We know it when we see it. But just what is energy, anyway? When it comes to being […]
It was Stephen Hawking’s obsession for the last 30 years of his life. Here’s why it matters. When it comes to the sciences, sometimes making two observations or measurements that appear […]
Before there were humans, planets, or even stars and galaxies, we had to make the first elements. Here’s how they happened. From the first moments of Big Bang to the […]
If we know how big the observable Universe is, why can’t we figure out how big the unobservable part is? 13.8 billion years ago, the Big Bang occurred. The Universe was […]
Immediately after the Big Bang, the Universe was more energetic than ever. What was it like? When we look out at the Universe today, we see that it’s full of stars […]
And if we did, what would happen if you fell in? Out in the countryside of rural America, you can find all sorts of attractions that are too-good-to-be-true. One of the […]
The paradox is one that Hawking himself claimed to have a solution to many times, but none of the proposals have held up to scrutiny. The paradox is still unresolved. […]
It’s a fascinating idea, but how does it fare as a scientific theory? “Something is happening here and this is going to have an impact.” –Robert Dijkgraaf, on Verlinde’s work The […]
Even if you have a problem with the messenger, you still need to heed the message. “Whether humans are responsible for the bulk of climate change is going to be left […]
Was it really a low-entropy state? And what does that mean for the second law of thermodynamics? “Entropy shakes its angry fist at you for being clever enough to organize […]
The latest challenger to dark matter’s throne may not be so difficult to knock off, after all. This post was written by Sabine Hossenfelder. Sabine is a theoretical physicist specialized in […]
In the depths of intergalactic space, the Big Bang’s leftover glow is just 2.73 K. But this spot in our own galaxy is even colder. “If you want your boomerang to […]