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Ask Ethan: What are the “first stars” in the Universe?

Ask Ethan: What are the “first stars” in the Universe?

If the Universe is 13.8 billion years old today, but different ages the farther we look back, what does it mean for a star to be the first?
Go to the profile of Ethan Siegel
Ethan Siegel
780,000 galaxies revealed in JWST’s largest science operation

780,000 galaxies revealed in JWST’s largest science operation

The COSMOS-Web has just finalized their release of their full field: larger and deeper than any other JWST program. Here’s what’s inside.
Go to the profile of Ethan Siegel
Ethan Siegel
Anomaly no more! “Muon g-2” puzzle resolved at last

Anomaly no more! “Muon g-2” puzzle resolved at last

When theory and experiment disagree, it could mean new physics. This time, they solved the muon g-2 puzzle, and saved the Standard Model.
Go to the profile of Ethan Siegel
Ethan Siegel
How the Milky Way-Andromeda merger became so uncertain

How the Milky Way-Andromeda merger became so uncertain

For decades, astronomers have claimed the Milky Way will merge with Andromeda in ~4 billion years. Here’s why, in 2025, that seems…
Go to the profile of Ethan Siegel
Ethan Siegel
10 quotes about science’s value to society

10 quotes about science’s value to society

As US science faces record cuts to funding, jobs, and facilities, these 10 quotes help remind us how science brings value to us all.
Go to the profile of Ethan Siegel
Ethan Siegel
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