Ethan Siegel – Medium

Ethan Siegel

Published in
Starts With A Bang!

JWST fully solves the mystery of “Little Red Dots”

The discovery of ultra-bright, ultra-distant galaxies was JWST’s first big surprise. They didn’t “break the Universe,” and now we know why.

6h ago

JWST fully solves the mystery of “Little Red Dots”

6h ago

Published in
Starts With A Bang!

Cosmic first: supermassive black hole caught “turning on” in real-time

Seven years ago, an outburst in a distant galaxy brightened and faded away. Afterwards, a new supermassive black hole jet emerged, but how?

1d ago

Cosmic first: supermassive black hole caught “turning on” in real-time

1d ago

Published in
Starts With A Bang!

What’s hotter than the hottest stars in the Universe?

Here in our Universe, stars shine brightly, providing light and heat to planets, moons, and more. But some objects get even hotter, by far.

2d ago

What’s hotter than the hottest stars in the Universe?

2d ago

Published in
Starts With A Bang!

Starts With A Bang podcast #113 — Weird stars

Most stars shine with properties, like brightness, that barely change at all with time. The ones that do vary help us unlock the Universe.

4d ago

Starts With A Bang podcast #113 — Weird stars

4d ago

Published in
Starts With A Bang!

Ask Ethan: How do photons mediate both attraction and repulsion?

The electromagnetic force can be attractive, repulsive, or “bendy,” but is always mediated by the photon. How does one particle do it all?

5d ago

Ask Ethan: How do photons mediate both attraction and repulsion?

5d ago

Published in
Starts With A Bang!

Black hole myth busted: they don’t suck anything in

Many of us look at black holes as cosmic vacuum cleaners: sucking in everything in their vicinity. But it turns out they don’t suck at all.

6d ago

Black hole myth busted: they don’t suck anything in

6d ago

Published in
Starts With A Bang!

The quantum reason that ultra-massive stars are forbidden

There’s no upper limit to how massive galaxies or black holes can be, but the most massive known star is only ~260 solar masses. Here’s…

Jan 15

The quantum reason that ultra-massive stars are forbidden

Jan 15

Published in
Starts With A Bang!

25 year update on the “Millennium problems” in physics

In the year 2000, physicists created a list of the ten most important unsolved problems in their field. 25 years later, here’s where we…

Jan 14

25 year update on the “Millennium problems” in physics

Jan 14

Published in
Starts With A Bang!

How far back in time can we see in space?

We see objects whose light only arrives just now. But we see them as they were in the past: when that now-arriving light was first emitted.

Jan 13

How far back in time can we see in space?

Jan 13

Published in
Starts With A Bang!

Ask Ethan: Can a lumpy Universe explain dark energy?

Our Universe isn’t just expanding, the expansion is accelerating. Instead of dark energy, could a “lumpy” Universe be at fault?

Jan 10

Ask Ethan: Can a lumpy Universe explain dark energy?

Jan 10

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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