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The Hubble tension: still unresolved, despite new measurements
The Hubble tension: still unresolved, despite new measurements
The big question isn’t whether the Universe is expanding at 67 or 73 km/s/Mpc. It’s why different methods yield such different answers.
Ethan Siegel
Aug 21
Relativity: the oldest physics principle that’s still correct
Relativity: the oldest physics principle that’s still correct
The original principle of relativity, proposed by Galileo way back in the early 1600s, remains true in its unchanged form even today.
Ethan Siegel
Aug 20
Our cosmic home is typical for stars, but not for galaxies
Our cosmic home is typical for stars, but not for galaxies
Most stars in the Universe are located in big, massive, Milky Way-like galaxies. But most galaxies aren’t like ours at all.
Ethan Siegel
Aug 19
Ask Ethan: Could we build a collider bigger than Earth?
Ask Ethan: Could we build a collider bigger than Earth?
The largest particle accelerator and collider ever built is the Large Hadron Collider at CERN. Why not go much, much bigger?
Ethan Siegel
Aug 16
3 big lessons from Einstein’s most famous equation: E=mc²
3 big lessons from Einstein’s most famous equation: E=mc²
More than any other equation in physics, E = mc² is recognizable and profound. But what do we actually learn about reality from it?
Ethan Siegel
Aug 15
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