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The Universe might never run out of hydrogen
The Universe might never run out of hydrogen
The most common element in the Universe, vital for forming new stars, is hydrogen. But there’s a finite amount of it; what if we run out?
Ethan Siegel
May 1
The unsurprising non-detection of intelligent aliens
The unsurprising non-detection of intelligent aliens
Life arose on Earth very early on. After a few billion years, here we are: intelligent and technologically advanced. Where’s everyone else?
Ethan Siegel
Apr 30
If photons have mass, could they explain dark matter?
If photons have mass, could they explain dark matter?
Our Universe requires dark matter in order to make sense of things, astrophysically. Could massive photons do the trick?
Ethan Siegel
Apr 29
The idea that matter is mostly empty space is mostly wrong
The idea that matter is mostly empty space is mostly wrong
Practically all of the matter we see and interact with is made of atoms, which are mostly empty space. Then why is reality so… solid?
Ethan Siegel
Apr 26
The big idea of Grand Unified Theories of physics
The big idea of Grand Unified Theories of physics
If the electromagnetic and weak forces unify to make the electroweak force, maybe, at higher energies, something even grander happens?
Ethan Siegel
Apr 25
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