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Ask Ethan: Couldn’t COVID-19 have originated in a Chinese Lab?

Ask Ethan: Couldn’t COVID-19 have originated in a Chinese Lab?

In theory, scientists could’ve produced a deadly virus that accidentally infected lab workers. In practice, we know that didn’t happen.
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Ethan Siegel
Why nuclear reactions on an exoplanet won’t imply alien life

Why nuclear reactions on an exoplanet won’t imply alien life

Planets can create nuclear power on their own, naturally, without any intelligence or technology. Earth already did: 1.7 billion years ago.
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Ethan Siegel
The sky is brighter than astronomers imagined

The sky is brighter than astronomers imagined

The most famous Hubble images show glittering stars and galaxies amidst the black backdrop of space. But more was captured than we…
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Ethan Siegel
How has cosmology changed from 2000 to 2025?

How has cosmology changed from 2000 to 2025?

25 years ago, our concordance picture of cosmology, also known as ΛCDM, came into focus. 25 years later, are we about to break that model?
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Ethan Siegel
Will the Sun make a planetary nebula when it dies?

Will the Sun make a planetary nebula when it dies?

In around 7 billion years, we expect the Sun to run out of fuel, dying in a planetary nebula/white dwarf combination. Is that for certain?
Go to the profile of Ethan Siegel
Ethan Siegel
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