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Why do we count the Universe’s age from 13.8 billion years ago?
Why do we count the Universe’s age from 13.8 billion years ago?
The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?
Ethan Siegel
Aug 26
If the Big Bang wasn’t the first thing ever, what caused it?
If the Big Bang wasn’t the first thing ever, what caused it?
Many contrarians dispute that cosmic inflation occurred. The evidence says otherwise.
Ethan Siegel
Aug 23
Is it true that photons truly live forever?
Is it true that photons truly live forever?
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
Aug 22
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
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