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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
Not a constant: the Hubble “constant” changes over time
Not a constant: the Hubble “constant” changes over time
The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?
Ethan Siegel
Apr 24
Does light itself truly have an infinite lifetime?
Does light itself truly have an infinite lifetime?
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
Ethan Siegel
Apr 23
No, the expanding Universe doesn’t break the speed of light
No, the expanding Universe doesn’t break the speed of light
Yes, the Universe is expanding, but if you’ve ever wondered, “How fast is it expanding,” the answer isn’t in terms of a speed at all.
Ethan Siegel
Apr 22
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