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Ask Ethan: What does it mean to live in a quantum universe?

Ask Ethan: What does it mean to live in a quantum universe?

Over a century after we first unlocked the secrets of the quantum universe, people find it more puzzling than ever. Can we make sense of…
Go to the profile of Ethan Siegel
Ethan Siegel
100 years ago, Cecilia Payne discovered what the stars are made of

100 years ago, Cecilia Payne discovered what the stars are made of

For centuries, even after we knew the Sun was a star like any other, we still didn’t know what it was made of. Cecilia Payne changed that.
Go to the profile of Ethan Siegel
Ethan Siegel
Is dark energy weakening? DESI’s results are ambiguous

Is dark energy weakening? DESI’s results are ambiguous

DESI, by mapping galaxies, has claimed they see evidence for dark energy evolving by getting weaker. But that’s only one interpretation.
Go to the profile of Ethan Siegel
Ethan Siegel
Just one exo-Earth pixel can reveal continents, oceans, and more

Just one exo-Earth pixel can reveal continents, oceans, and more

Even from a single pixel, multiwavelength data taken over time can reveal clouds, icecaps, oceans, continents, and even signs of life.
Go to the profile of Ethan Siegel
Ethan Siegel
The most distant galaxy has oxygen, and that’s no surprise

The most distant galaxy has oxygen, and that’s no surprise

Someday, we’ll look back and see a young galaxy forming stars for the first time. JADES-GS-z14-0, the farthest ever, isn’t early enough.
Go to the profile of Ethan Siegel
Ethan Siegel
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