Ethan Siegel – Medium

Ethan Siegel

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Starts With A Bang!

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?

1d ago

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

1d ago

Published in

Starts With A Bang!

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.

2d ago

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

2d ago

Published in

Starts With A Bang!

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.

3d ago

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

3d ago

Published in

Starts With A Bang!

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…

4d ago

How the Milky Way-Andromeda merger became so uncertain

4d ago

Published in

Starts With A Bang!

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.

5d ago

10 quotes about science’s value to society

5d ago

Published in

Starts With A Bang!

Ask Ethan: What would the Universe be like without dark matter?

In our Universe, dark matter outmasses normal matter by a 5-to-1 ratio, shaping the Universe as we know it. What if it simply weren’t…

Jun 6

Ask Ethan: What would the Universe be like without dark matter?

Jun 6

Published in

Starts With A Bang!

How fast does planet Earth move through space?

It rotates on its axis, revolves around the Sun, moves throughout the Milky Way, and gets carried by our galaxy all throughout space.

Jun 5

How fast does planet Earth move through space?

Jun 5

Published in

Starts With A Bang!

The mystery of neutrino mass is now smaller than ever

The long-elusive neutrino was shown to have a bizarre property no one expected: mass. New, tightest-ever limits have profound implications.

Jun 4

The mystery of neutrino mass is now smaller than ever

Jun 4

Published in

Starts With A Bang!

JWST won’t find the very first stars, but a new telescope can

Many were hoping that JWST would find the first stars of all. Despite many hopeful claims, it hasn’t, and probably can’t. Here’s how we…

Jun 3

JWST won’t find the very first stars, but a new telescope can

Jun 3

Published in

Starts With A Bang!

Ask Ethan: Was the Universe “timeless” before the Big Bang?

Here in our Universe, time passes at a fixed rate for all observers: one second-per-second. Before the Big Bang, things were very…

May 30

Ask Ethan: Was the Universe “timeless” before the Big Bang?

May 30

Ethan Siegel

Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

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