Ethan Siegel – Medium

Ethan Siegel

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Starts With A Bang!

Ask Ethan: Could the CMB arise from galaxies, not the Big Bang?

The CMB has long been considered the Big Bang’s “smoking gun” evidence. But after what JWST saw, might it come from early galaxies instead?

15h ago

Ask Ethan: Could the CMB arise from galaxies, not the Big Bang?

15h ago

Published in

Starts With A Bang!

A unique mission to both Uranus and Neptune could launch in 2034

Once every 12 years, Earth, Jupiter, Uranus, and Neptune all line up, opening a window for a joint mission. Our next chance arrives in…

1d ago

A unique mission to both Uranus and Neptune could launch in 2034

1d ago

Published in

Starts With A Bang!

Will American science become the “Hitler’s gift” of the 21st century?

Over the first half of 2025, the USA has cut science as never before. This disaster for American science is a gift to the rest of the…

2d ago

Will American science become the “Hitler’s gift” of the 21st century?

2d ago

Published in

Starts With A Bang!

JWST’s early galaxies didn’t break the Universe. They revealed it.

Originally, the abundance of bright, early galaxies shocked astronomers. After 3 years of JWST, we now know what’s really going on.

3d ago

JWST’s early galaxies didn’t break the Universe. They revealed it.

3d ago

Published in

Starts With A Bang!

5 ways our naked-eye views of the night sky deceive us

Looking at a dark, night sky has filled humans with a sense of awe and wonder since prehistoric times. But appearances can be deceiving.

4d ago

5 ways our naked-eye views of the night sky deceive us

4d ago

Published in

Starts With A Bang!

Ask Ethan: What puzzles can the Vera Rubin Observatory help solve?

In just its first 10 hours of observations, the Vera Rubin observatory discovered more than 2000 new asteroids. What else will it teach us?

Jul 4

Ask Ethan: What puzzles can the Vera Rubin Observatory help solve?

Jul 4

Published in

Starts With A Bang!

Busting the top 5 myths about the Big Bang

For over 50 years, it’s been the scientifically accepted theory describing the origin of the Universe. It’s time we all learned its truths.

Jul 3

Busting the top 5 myths about the Big Bang

Jul 3

Published in

Starts With A Bang!

JWST discovers how we’re able to see the Universe at all

For hundreds of millions of years, a cosmic fog blocked all signs of starlight. At last, JWST found the galaxies that cleared that fog…

Jul 2

JWST discovers how we’re able to see the Universe at all

Jul 2

Published in

Starts With A Bang!

You can’t do your own research without doing your homework first

Here in 2025, many of us claim to come to our own conclusions by doing our own research. Here’s why we’re mostly deluding ourselves.

Jul 1

You can’t do your own research without doing your homework first

Jul 1

Published in

Starts With A Bang!

JWST captures its most extreme gravitational lens ever

Massive galaxy cluster Abell S1063, 4.5 billion light-years away, bends and distorts the space nearby. Here’s what a JWST deep field shows.

Jun 30

JWST captures its most extreme gravitational lens ever

Jun 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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