Ethan Siegel – Medium

Ethan Siegel

Published in

Starts With A Bang!

Ask Ethan: Could dark energy be more negative than a cosmological constant?

The fact that our Universe’s expansion is accelerating implies that dark energy exists. But could it be even weirder than we’ve imagined?

1d ago

Ask Ethan: Could dark energy be more negative than a cosmological constant?

1d ago

Published in

Starts With A Bang!

The red color of Mars is mere inches deep

The surface and atmosphere is colored by ferric oxides. Beneath a very thin layer, mere millimeters deep in places, it’s not red anymore.

2d ago

The red color of Mars is mere inches deep

2d ago

Published in

Starts With A Bang!

Does physics truly have anything to say about consciousness?

Many, from neuroscientists to philosophers to anesthesiologists, have claimed to understand consciousness. Do physicists? Does anyone?

3d ago

Does physics truly have anything to say about consciousness?

3d ago

Published in

Starts With A Bang!

Astronomers just found the smallest galaxy ever

With stars, gas, and dark matter, galaxies come in a great array of sizes. This new one, Ursa Major III/UNIONS 1, is the smallest by far.

4d ago

Astronomers just found the smallest galaxy ever

4d ago

Published in

Starts With A Bang!

11 NASA astrophysics missions face risk of cancellation

NASA astrophysics, which gave us Hubble, JWST, and so much more, faces its greatest budget cut in history. All future missions are at risk.

5d ago

11 NASA astrophysics missions face risk of cancellation

5d ago

Published in

Starts With A Bang!

Starts With A Bang podcast #117 — Gravitational waves and the Universe

Just 10 years ago, humanity had never directly detected a single gravitational wave. We’re closing in on 300 now, with so much more to…

May 17

Starts With A Bang podcast #117 — Gravitational waves and the Universe

May 17

Published in

Starts With A Bang!

Ask Ethan: Has the USA become a fascist nation in 2025?

Fascism was a powerful, evil force in the 20th century, notably in Italy, Germany, and Spain. Is the USA repeating history here in 2025?

May 16

Ask Ethan: Has the USA become a fascist nation in 2025?

May 16

Published in

Starts With A Bang!

The Universe is not symmetric

The laws of physics obey certain symmetries and defy others. It’s theoretically tempting to add new ones, but reality doesn’t agree.

May 15

The Universe is not symmetric

May 15

Published in

Starts With A Bang!

What to know about vaccines in the do-your-own-research era

For centuries, vaccines have been the top life-saving, expert medical intervention known to humans. How can individuals make the right…

May 14

What to know about vaccines in the do-your-own-research era

May 14

Published in

Starts With A Bang!

The most “boring” part of cosmic history shaped our modern Universe

It took nearly 400,000 years, after the Big Bang, to first form neutral atoms. The imprints from that early time can now be seen…

May 13

The most “boring” part of cosmic history shaped our modern Universe

May 13

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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