Ethan Siegel – Medium

Ethan Siegel

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?

17h ago

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

17h 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.

1d ago

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

1d 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…

2d ago

The quantum reason that ultra-massive stars are forbidden

2d ago

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…

3d ago

25 year update on the “Millennium problems” in physics

3d ago

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.

4d ago

How far back in time can we see in space?

4d ago

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

Published in
Starts With A Bang!

The quantum reason that explains why the Sun shines

Despite the Sun’s high core temperatures, atomic nuclei repel each other too strongly to fuse together. Good thing for quantum physics!

Jan 9

The quantum reason that explains why the Sun shines

Jan 9

Published in
Starts With A Bang!

The one-page calendar that changes how you view the year

It’s simpler, more compact, and reusable from year-to-year in a way that no other calendar is. Here’s both how it works and how to use it.

Jan 8

The one-page calendar that changes how you view the year

Jan 8

Published in
Starts With A Bang!

Is the universe actually a fractal?

On larger and larger scales, many of the same structures we see at small ones repeat themselves. Do we live in a fractal Universe?

Jan 7

$Is the universe actually a fractal?$

$Is the universe actually a fractal?$

Jan 7

Published in
Starts With A Bang!

This weird JWST trick lets us “see” dark matter

It’s not only the gravity from galaxies in a cluster that reveal dark matter, but the ejected, intracluster stars actually trace it out.

Jan 6

This weird JWST trick lets us “see” dark matter

Jan 6

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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